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<a href="async__adapter__rcv_8hpp.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a id="l00001" name="l00001"></a><span class="lineno">    1</span><span class="comment">/* Flow-IPC: Core</span></div>
<div class="line"><a id="l00002" name="l00002"></a><span class="lineno">    2</span><span class="comment"> * Copyright 2023 Akamai Technologies, Inc.</span></div>
<div class="line"><a id="l00003" name="l00003"></a><span class="lineno">    3</span><span class="comment"> *</span></div>
<div class="line"><a id="l00004" name="l00004"></a><span class="lineno">    4</span><span class="comment"> * Licensed under the Apache License, Version 2.0 (the</span></div>
<div class="line"><a id="l00005" name="l00005"></a><span class="lineno">    5</span><span class="comment"> * &quot;License&quot;); you may not use this file except in</span></div>
<div class="line"><a id="l00006" name="l00006"></a><span class="lineno">    6</span><span class="comment"> * compliance with the License.  You may obtain a copy</span></div>
<div class="line"><a id="l00007" name="l00007"></a><span class="lineno">    7</span><span class="comment"> * of the License at</span></div>
<div class="line"><a id="l00008" name="l00008"></a><span class="lineno">    8</span><span class="comment"> *</span></div>
<div class="line"><a id="l00009" name="l00009"></a><span class="lineno">    9</span><span class="comment"> *   https://www.apache.org/licenses/LICENSE-2.0</span></div>
<div class="line"><a id="l00010" name="l00010"></a><span class="lineno">   10</span><span class="comment"> *</span></div>
<div class="line"><a id="l00011" name="l00011"></a><span class="lineno">   11</span><span class="comment"> * Unless required by applicable law or agreed to in</span></div>
<div class="line"><a id="l00012" name="l00012"></a><span class="lineno">   12</span><span class="comment"> * writing, software distributed under the License is</span></div>
<div class="line"><a id="l00013" name="l00013"></a><span class="lineno">   13</span><span class="comment"> * distributed on an &quot;AS IS&quot; BASIS, WITHOUT WARRANTIES OR</span></div>
<div class="line"><a id="l00014" name="l00014"></a><span class="lineno">   14</span><span class="comment"> * CONDITIONS OF ANY KIND, either express or implied.</span></div>
<div class="line"><a id="l00015" name="l00015"></a><span class="lineno">   15</span><span class="comment"> * See the License for the specific language governing</span></div>
<div class="line"><a id="l00016" name="l00016"></a><span class="lineno">   16</span><span class="comment"> * permissions and limitations under the License. */</span></div>
<div class="line"><a id="l00017" name="l00017"></a><span class="lineno">   17</span><span class="comment"></span> </div>
<div class="line"><a id="l00018" name="l00018"></a><span class="lineno">   18</span><span class="comment">/// @file</span></div>
<div class="line"><a id="l00019" name="l00019"></a><span class="lineno">   19</span><span class="comment"></span><span class="preprocessor">#pragma once</span></div>
<div class="line"><a id="l00020" name="l00020"></a><span class="lineno">   20</span> </div>
<div class="line"><a id="l00021" name="l00021"></a><span class="lineno">   21</span><span class="preprocessor">#include &quot;<a class="code" href="detail_2transport__fwd_8hpp.html">ipc/transport/detail/transport_fwd.hpp</a>&quot;</span></div>
<div class="line"><a id="l00022" name="l00022"></a><span class="lineno">   22</span><span class="preprocessor">#include &quot;<a class="code" href="ipc__core_2src_2ipc_2transport_2error_8hpp.html">ipc/transport/error.hpp</a>&quot;</span></div>
<div class="line"><a id="l00023" name="l00023"></a><span class="lineno">   23</span><span class="preprocessor">#include &lt;flow/log/log.hpp&gt;</span></div>
<div class="line"><a id="l00024" name="l00024"></a><span class="lineno">   24</span><span class="preprocessor">#include &lt;flow/async/single_thread_task_loop.hpp&gt;</span></div>
<div class="line"><a id="l00025" name="l00025"></a><span class="lineno">   25</span><span class="preprocessor">#include &lt;boost/move/make_unique.hpp&gt;</span></div>
<div class="line"><a id="l00026" name="l00026"></a><span class="lineno">   26</span><span class="preprocessor">#include &lt;queue&gt;</span></div>
<div class="line"><a id="l00027" name="l00027"></a><span class="lineno">   27</span> </div>
<div class="line"><a id="l00028" name="l00028"></a><span class="lineno">   28</span><span class="keyword">namespace </span><a class="code hl_namespace" href="namespaceipc_1_1transport_1_1sync__io.html">ipc::transport::sync_io</a></div>
<div class="line"><a id="l00029" name="l00029"></a><span class="lineno">   29</span>{</div>
<div class="line"><a id="l00030" name="l00030"></a><span class="lineno">   30</span> </div>
<div class="line"><a id="l00031" name="l00031"></a><span class="lineno">   31</span><span class="comment">// Types.</span></div>
<div class="line"><a id="l00032" name="l00032"></a><span class="lineno">   32</span><span class="comment"></span> </div>
<div class="line"><a id="l00033" name="l00033"></a><span class="lineno">   33</span><span class="comment">/**</span></div>
<div class="line"><a id="l00034" name="l00034"></a><span class="lineno">   34</span><span class="comment"> * Internal-use type that adapts a given PEER-state sync_io::Native_handle_receiver or sync_io::Blob_receiver *core*</span></div>
<div class="line"><a id="l00035" name="l00035"></a><span class="lineno">   35</span><span class="comment"> * into the async-I/O-pattern Native_handle_receiver or Blob_receiver.  State-mutating logic of the latter is forwarded</span></div>
<div class="line"><a id="l00036" name="l00036"></a><span class="lineno">   36</span><span class="comment"> * to a `*this`; while trivial `const` (in PEER state) things like `.receive_blob_max_size()` are forwarded directly to</span></div>
<div class="line"><a id="l00037" name="l00037"></a><span class="lineno">   37</span><span class="comment"> * the core `sync_io::X`.</span></div>
<div class="line"><a id="l00038" name="l00038"></a><span class="lineno">   38</span><span class="comment"> *</span></div>
<div class="line"><a id="l00039" name="l00039"></a><span class="lineno">   39</span><span class="comment"> * @see transport::Native_socket_stream::Impl uses this for 99% of its incoming-direction</span></div>
<div class="line"><a id="l00040" name="l00040"></a><span class="lineno">   40</span><span class="comment"> *      (PEER-state by definition) logic.</span></div>
<div class="line"><a id="l00041" name="l00041"></a><span class="lineno">   41</span><span class="comment"> * @see transport::Blob_stream_mq_receiver_impl uses this for 99% of its logic.</span></div>
<div class="line"><a id="l00042" name="l00042"></a><span class="lineno">   42</span><span class="comment"> *</span></div>
<div class="line"><a id="l00043" name="l00043"></a><span class="lineno">   43</span><span class="comment"> * @see Async_adapter_sender for the opposite-direction thing.  E.g., transport::Native_socket_stream::Impl</span></div>
<div class="line"><a id="l00044" name="l00044"></a><span class="lineno">   44</span><span class="comment"> *      uses that for 99% of its outgoing-direction logic.</span></div>
<div class="line"><a id="l00045" name="l00045"></a><span class="lineno">   45</span><span class="comment"> *</span></div>
<div class="line"><a id="l00046" name="l00046"></a><span class="lineno">   46</span><span class="comment"> * ### Threads and thread nomenclature; locking ###</span></div>
<div class="line"><a id="l00047" name="l00047"></a><span class="lineno">   47</span><span class="comment"> * Thread U, thread W... locking... just see those sections in transport::Native_socket_stream::Impl class doc header.</span></div>
<div class="line"><a id="l00048" name="l00048"></a><span class="lineno">   48</span><span class="comment"> * We adopt that nomenclature and logic.  However, as we are concerned with only one direction (op-type),</span></div>
<div class="line"><a id="l00049" name="l00049"></a><span class="lineno">   49</span><span class="comment"> * we only deal with code in either thread U or W concerned with that.  The other-direction code -- if applicable</span></div>
<div class="line"><a id="l00050" name="l00050"></a><span class="lineno">   50</span><span class="comment"> * (e.g., applicable for `Native_socket_stream` which deals with both over 1 socket connection; N/A</span></div>
<div class="line"><a id="l00051" name="l00051"></a><span class="lineno">   51</span><span class="comment"> * for `Blob_stream_mq_*` which uses separate objects entirely) -- simply co-exists in the same thread W and &quot;thread&quot;</span></div>
<div class="line"><a id="l00052" name="l00052"></a><span class="lineno">   52</span><span class="comment"> * U.  (If `Native_socket_stream` wanted to, it could even parallelize stuff in thread W by using separate worker</span></div>
<div class="line"><a id="l00053" name="l00053"></a><span class="lineno">   53</span><span class="comment"> * threads Ws and Wr.  As of this writing it does not, but it could -- nothing in `*this` would change.)</span></div>
<div class="line"><a id="l00054" name="l00054"></a><span class="lineno">   54</span><span class="comment"> *</span></div>
<div class="line"><a id="l00055" name="l00055"></a><span class="lineno">   55</span><span class="comment"> * Note, again, that we have our own `m_mutex`.  If there is an opposing-direction counterpart Async_adapter_sender,</span></div>
<div class="line"><a id="l00056" name="l00056"></a><span class="lineno">   56</span><span class="comment"> * then it has its own `m_mutex`; hence things can proceed concurrently.</span></div>
<div class="line"><a id="l00057" name="l00057"></a><span class="lineno">   57</span><span class="comment"> *</span></div>
<div class="line"><a id="l00058" name="l00058"></a><span class="lineno">   58</span><span class="comment"> * ### Impl design ###</span></div>
<div class="line"><a id="l00059" name="l00059"></a><span class="lineno">   59</span><span class="comment"> * This is almost entirely subsumed by our `sync_io` core, Async_adapter_receiver::Core, an instance of</span></div>
<div class="line"><a id="l00060" name="l00060"></a><span class="lineno">   60</span><span class="comment"> * sync_io::Native_handle_receiver or sync_io::Blob_receiver.  It has a receive op-type (possibly among others), so we</span></div>
<div class="line"><a id="l00061" name="l00061"></a><span class="lineno">   61</span><span class="comment"> * invoke its `&quot;sync_io::*_sender:start_receive_blob_ops()&quot;` during our initialization.  After that:</span></div>
<div class="line"><a id="l00062" name="l00062"></a><span class="lineno">   62</span><span class="comment"> *</span></div>
<div class="line"><a id="l00063" name="l00063"></a><span class="lineno">   63</span><span class="comment"> * For idle_timer_run(), we can again just forward it to `m_sync_io`.  There&#39;s no completion</span></div>
<div class="line"><a id="l00064" name="l00064"></a><span class="lineno">   64</span><span class="comment"> * handler either, unlike with `.async_end_sending()`, so it&#39;s even simpler -- just straight forwarding to</span></div>
<div class="line"><a id="l00065" name="l00065"></a><span class="lineno">   65</span><span class="comment"> * the `sync_io` core.</span></div>
<div class="line"><a id="l00066" name="l00066"></a><span class="lineno">   66</span><span class="comment"> *</span></div>
<div class="line"><a id="l00067" name="l00067"></a><span class="lineno">   67</span><span class="comment"> * For async_receive_native_handle() (and its degenerate version async_receive_blob()) the `*_receiver` concept</span></div>
<div class="line"><a id="l00068" name="l00068"></a><span class="lineno">   68</span><span class="comment"> * we implement has an extra feature on top of sync_io::Native_handle_receiver (and degenerate version,</span></div>
<div class="line"><a id="l00069" name="l00069"></a><span class="lineno">   69</span><span class="comment"> * sync_io::Blob_receiver): when 1 async_receive_native_handle() is in progress asynchronously, it is allowed</span></div>
<div class="line"><a id="l00070" name="l00070"></a><span class="lineno">   70</span><span class="comment"> * to invoke it again an arbitrary number of times, and they are to be served in the order they were called.</span></div>
<div class="line"><a id="l00071" name="l00071"></a><span class="lineno">   71</span><span class="comment"> * Therefore:</span></div>
<div class="line"><a id="l00072" name="l00072"></a><span class="lineno">   72</span><span class="comment"> *   - We maintain a &quot;deficit&quot; queue of these requests.  The currently-served request is stored in</span></div>
<div class="line"><a id="l00073" name="l00073"></a><span class="lineno">   73</span><span class="comment"> *     `User_request m_user_request`.  The queued-up subsequent ones are stored in queue with that</span></div>
<div class="line"><a id="l00074" name="l00074"></a><span class="lineno">   74</span><span class="comment"> *     same element type, `m_pending_user_requests_q`.</span></div>
<div class="line"><a id="l00075" name="l00075"></a><span class="lineno">   75</span><span class="comment"> *   - When the ongoing (single) `m_sync_io.async_receive_*()` does complete -- which occurs in thread W --</span></div>
<div class="line"><a id="l00076" name="l00076"></a><span class="lineno">   76</span><span class="comment"> *     we emit the result (`Error_code`, `sz`) to the `&quot;User_request::m_on_done_func&quot;` (the completion</span></div>
<div class="line"><a id="l00077" name="l00077"></a><span class="lineno">   77</span><span class="comment"> *     handler from the user).  Then we pop `m_pending_user_requests_q` (unless empty -- no further &quot;deficit&quot;)</span></div>
<div class="line"><a id="l00078" name="l00078"></a><span class="lineno">   78</span><span class="comment"> *     into `m_user_request` and service *that* one via `m_sync_io.async_receive_*()`.  Rinse/repeat.</span></div>
<div class="line"><a id="l00079" name="l00079"></a><span class="lineno">   79</span><span class="comment"> *</span></div>
<div class="line"><a id="l00080" name="l00080"></a><span class="lineno">   80</span><span class="comment"> * If the destructor is invoked before `m_user_request` can get serviced, then in the dtor</span></div>
<div class="line"><a id="l00081" name="l00081"></a><span class="lineno">   81</span><span class="comment"> * we execute `on_done_func(E)`, where E is operation-aborted.  Once that&#39;s done the dtor can finish.</span></div>
<div class="line"><a id="l00082" name="l00082"></a><span class="lineno">   82</span><span class="comment"> */</span></div>
<div class="line"><a id="l00083" name="l00083"></a><span class="lineno">   83</span><span class="keyword">template</span>&lt;<span class="keyword">typename</span> Core_t&gt;</div>
<div class="line"><a id="l00084" name="l00084"></a><span class="lineno"><a class="line" href="classipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver.html">   84</a></span><span class="keyword">class </span><a class="code hl_class" href="classipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver.html">Async_adapter_receiver</a> :</div>
<div class="line"><a id="l00085" name="l00085"></a><span class="lineno">   85</span>  <span class="keyword">public</span> flow::log::Log_context,</div>
<div class="line"><a id="l00086" name="l00086"></a><span class="lineno">   86</span>  <span class="keyword">private</span> boost::noncopyable</div>
<div class="line"><a id="l00087" name="l00087"></a><span class="lineno">   87</span>{</div>
<div class="line"><a id="l00088" name="l00088"></a><span class="lineno">   88</span><span class="keyword">public</span>:</div>
<div class="line"><a id="l00089" name="l00089"></a><span class="lineno">   89</span>  <span class="comment">// Types.</span></div>
<div class="line"><a id="l00090" name="l00090"></a><span class="lineno">   90</span><span class="comment"></span> </div>
<div class="line"><a id="l00091" name="l00091"></a><span class="lineno">   91</span><span class="comment">  /// The `sync_io::X` type being adapted into async-I/O-pattern `X`.</span></div>
<div class="line"><a id="l00092" name="l00092"></a><span class="lineno"><a class="line" href="classipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver.html#aeb37be595e9cfce9e0185acee7eeac80">   92</a></span><span class="comment"></span>  <span class="keyword">using </span><a class="code hl_typedef" href="classipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver.html#aeb37be595e9cfce9e0185acee7eeac80">Core</a> = Core_t;</div>
<div class="line"><a id="l00093" name="l00093"></a><span class="lineno">   93</span> </div>
<div class="line"><a id="l00094" name="l00094"></a><span class="lineno">   94</span>  <span class="comment">// Constructors/destructor.</span></div>
<div class="line"><a id="l00095" name="l00095"></a><span class="lineno">   95</span><span class="comment"></span> </div>
<div class="line"><a id="l00096" name="l00096"></a><span class="lineno">   96</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00097" name="l00097"></a><span class="lineno">   97</span><span class="comment">   * Constructs the adapter around `sync_io::X` object `*sync_io`.</span></div>
<div class="line"><a id="l00098" name="l00098"></a><span class="lineno">   98</span><span class="comment">   *</span></div>
<div class="line"><a id="l00099" name="l00099"></a><span class="lineno">   99</span><span class="comment">   * @param logger_ptr</span></div>
<div class="line"><a id="l00100" name="l00100"></a><span class="lineno">  100</span><span class="comment">   *        Logger to use for logging subsequently.</span></div>
<div class="line"><a id="l00101" name="l00101"></a><span class="lineno">  101</span><span class="comment">   * @param log_pfx</span></div>
<div class="line"><a id="l00102" name="l00102"></a><span class="lineno">  102</span><span class="comment">   *        String that shall precede ~all logged messages (e.g., `lexical_cast&lt;string&gt;(x)`, where `x` is an `X`.)</span></div>
<div class="line"><a id="l00103" name="l00103"></a><span class="lineno">  103</span><span class="comment">   * @param worker</span></div>
<div class="line"><a id="l00104" name="l00104"></a><span class="lineno">  104</span><span class="comment">   *        The worker thread loop of `X`.  Background work, as needed, will be posted onto this</span></div>
<div class="line"><a id="l00105" name="l00105"></a><span class="lineno">  105</span><span class="comment">   *        &quot;thread W.&quot;  Note that `X` may (or may not) share this thread with unrelated tasks;</span></div>
<div class="line"><a id="l00106" name="l00106"></a><span class="lineno">  106</span><span class="comment">   *        for example `Native_socket_stream` uses it for both a `*this` (outgoing-direction)</span></div>
<div class="line"><a id="l00107" name="l00107"></a><span class="lineno">  107</span><span class="comment">   *        and an Async_adapter_receiver (incoming-direction).  `*worker* must already be `-&gt;start()`ed.</span></div>
<div class="line"><a id="l00108" name="l00108"></a><span class="lineno">  108</span><span class="comment">   * @param sync_io</span></div>
<div class="line"><a id="l00109" name="l00109"></a><span class="lineno">  109</span><span class="comment">   *        The core object of `X`.  It should have just (irreversibly) entered state PEER.</span></div>
<div class="line"><a id="l00110" name="l00110"></a><span class="lineno">  110</span><span class="comment">   */</span></div>
<div class="line"><a id="l00111" name="l00111"></a><span class="lineno">  111</span>  <a class="code hl_function" href="classipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver.html#a2f32f38020a0d21499b1c0b724ff332b">Async_adapter_receiver</a>(flow::log::Logger* logger_ptr, <a class="code hl_typedef" href="namespaceipc_1_1util.html#ae6ac47812a90d1287c61e0b7de7bc4f5">util::String_view</a> log_pfx,</div>
<div class="line"><a id="l00112" name="l00112"></a><span class="lineno">  112</span>                         flow::async::Single_thread_task_loop* worker, <a class="code hl_typedef" href="classipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver.html#aeb37be595e9cfce9e0185acee7eeac80">Core</a>* sync_io);</div>
<div class="line"><a id="l00113" name="l00113"></a><span class="lineno">  113</span><span class="comment"></span> </div>
<div class="line"><a id="l00114" name="l00114"></a><span class="lineno">  114</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00115" name="l00115"></a><span class="lineno">  115</span><span class="comment">   * To be invoked after `-&gt;stop()`ping `*worker` (from ctor), as well as flushing any still-queued</span></div>
<div class="line"><a id="l00116" name="l00116"></a><span class="lineno">  116</span><span class="comment">   * tasks in its `Task_engine` (via `.restart()` and `.poll()`), this satisfies the customer adapter</span></div>
<div class="line"><a id="l00117" name="l00117"></a><span class="lineno">  117</span><span class="comment">   * dtor&#39;s contract which is to invoke any not-yet-fired completion handlers with special</span></div>
<div class="line"><a id="l00118" name="l00118"></a><span class="lineno">  118</span><span class="comment">   * operation-aborted error code.  In our case that is either nothing or 1 `async_end_sending()` completion</span></div>
<div class="line"><a id="l00119" name="l00119"></a><span class="lineno">  119</span><span class="comment">   * handler.  If applicable the dtor returns once that handler has completed in an unspecified thread</span></div>
<div class="line"><a id="l00120" name="l00120"></a><span class="lineno">  120</span><span class="comment">   * that is not the calling thread.</span></div>
<div class="line"><a id="l00121" name="l00121"></a><span class="lineno">  121</span><span class="comment">   */</span></div>
<div class="line"><a id="l00122" name="l00122"></a><span class="lineno">  122</span>  <a class="code hl_function" href="classipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver.html#a80428aeb0d3f9e836fe897fc1e42601a">~Async_adapter_receiver</a>();</div>
<div class="line"><a id="l00123" name="l00123"></a><span class="lineno">  123</span> </div>
<div class="line"><a id="l00124" name="l00124"></a><span class="lineno">  124</span>  <span class="comment">// Methods.</span></div>
<div class="line"><a id="l00125" name="l00125"></a><span class="lineno">  125</span><span class="comment"></span> </div>
<div class="line"><a id="l00126" name="l00126"></a><span class="lineno">  126</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00127" name="l00127"></a><span class="lineno">  127</span><span class="comment">   * See Native_handle_sender counterpart.  However, this one is `void`, as there is no way `*this` is not in PEER state</span></div>
<div class="line"><a id="l00128" name="l00128"></a><span class="lineno">  128</span><span class="comment">   * (by definition).</span></div>
<div class="line"><a id="l00129" name="l00129"></a><span class="lineno">  129</span><span class="comment">   *</span></div>
<div class="line"><a id="l00130" name="l00130"></a><span class="lineno">  130</span><span class="comment">   * @param target_hndl</span></div>
<div class="line"><a id="l00131" name="l00131"></a><span class="lineno">  131</span><span class="comment">   *        See Native_handle_sender counterpart.</span></div>
<div class="line"><a id="l00132" name="l00132"></a><span class="lineno">  132</span><span class="comment">   * @param target_meta_blob</span></div>
<div class="line"><a id="l00133" name="l00133"></a><span class="lineno">  133</span><span class="comment">   *        See Native_handle_sender counterpart.</span></div>
<div class="line"><a id="l00134" name="l00134"></a><span class="lineno">  134</span><span class="comment">   * @param on_done_func</span></div>
<div class="line"><a id="l00135" name="l00135"></a><span class="lineno">  135</span><span class="comment">   *        See Native_handle_sender counterpart.</span></div>
<div class="line"><a id="l00136" name="l00136"></a><span class="lineno">  136</span><span class="comment">   */</span></div>
<div class="line"><a id="l00137" name="l00137"></a><span class="lineno">  137</span>  <span class="keywordtype">void</span> <a class="code hl_function" href="classipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver.html#abcbc91de36b298c68e5461997a9a0263">async_receive_native_handle</a>(<a class="code hl_struct" href="structipc_1_1util_1_1Native__handle.html">Native_handle</a>* target_hndl,</div>
<div class="line"><a id="l00138" name="l00138"></a><span class="lineno">  138</span>                                   <span class="keyword">const</span> <a class="code hl_typedef" href="namespaceipc_1_1util.html#a6cb62ae434900f3a8915b33ec5d61a96">util::Blob_mutable</a>&amp; target_meta_blob,</div>
<div class="line"><a id="l00139" name="l00139"></a><span class="lineno">  139</span>                                   flow::async::Task_asio_err_sz&amp;&amp; on_done_func);</div>
<div class="line"><a id="l00140" name="l00140"></a><span class="lineno">  140</span><span class="comment"></span> </div>
<div class="line"><a id="l00141" name="l00141"></a><span class="lineno">  141</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00142" name="l00142"></a><span class="lineno">  142</span><span class="comment">   * See Blob_receiver counterpart.  However, this one is `void`, as there is no way `*this` is not in PEER state</span></div>
<div class="line"><a id="l00143" name="l00143"></a><span class="lineno">  143</span><span class="comment">   * (by definition).</span></div>
<div class="line"><a id="l00144" name="l00144"></a><span class="lineno">  144</span><span class="comment">   *</span></div>
<div class="line"><a id="l00145" name="l00145"></a><span class="lineno">  145</span><span class="comment">   * @param target_blob</span></div>
<div class="line"><a id="l00146" name="l00146"></a><span class="lineno">  146</span><span class="comment">   *        See Blob_receiver counterpart.</span></div>
<div class="line"><a id="l00147" name="l00147"></a><span class="lineno">  147</span><span class="comment">   * @param on_done_func</span></div>
<div class="line"><a id="l00148" name="l00148"></a><span class="lineno">  148</span><span class="comment">   *        See Blob_receiver counterpart.</span></div>
<div class="line"><a id="l00149" name="l00149"></a><span class="lineno">  149</span><span class="comment">   */</span></div>
<div class="line"><a id="l00150" name="l00150"></a><span class="lineno">  150</span>  <span class="keywordtype">void</span> <a class="code hl_function" href="classipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver.html#ade3098cb69a47a374cf0354677e2fb0b">async_receive_blob</a>(<span class="keyword">const</span> <a class="code hl_typedef" href="namespaceipc_1_1util.html#a6cb62ae434900f3a8915b33ec5d61a96">util::Blob_mutable</a>&amp; target_blob,</div>
<div class="line"><a id="l00151" name="l00151"></a><span class="lineno">  151</span>                          flow::async::Task_asio_err_sz&amp;&amp; on_done_func);</div>
<div class="line"><a id="l00152" name="l00152"></a><span class="lineno">  152</span><span class="comment"></span> </div>
<div class="line"><a id="l00153" name="l00153"></a><span class="lineno">  153</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00154" name="l00154"></a><span class="lineno">  154</span><span class="comment">   * See Native_handle_receiver counterpart.</span></div>
<div class="line"><a id="l00155" name="l00155"></a><span class="lineno">  155</span><span class="comment">   *</span></div>
<div class="line"><a id="l00156" name="l00156"></a><span class="lineno">  156</span><span class="comment">   * @param timeout</span></div>
<div class="line"><a id="l00157" name="l00157"></a><span class="lineno">  157</span><span class="comment">   *        See Native_handle_receiver counterpart.</span></div>
<div class="line"><a id="l00158" name="l00158"></a><span class="lineno">  158</span><span class="comment">   * @return See Native_handle_receiver counterpart.</span></div>
<div class="line"><a id="l00159" name="l00159"></a><span class="lineno">  159</span><span class="comment">   */</span></div>
<div class="line"><a id="l00160" name="l00160"></a><span class="lineno">  160</span>  <span class="keywordtype">bool</span> <a class="code hl_function" href="classipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver.html#a2067b525e54efd90bdc584cf77f7ae4b">idle_timer_run</a>(<a class="code hl_typedef" href="namespaceipc_1_1util.html#ac66141280c3b7295a86b65209f31cc58">util::Fine_duration</a> timeout);</div>
<div class="line"><a id="l00161" name="l00161"></a><span class="lineno">  161</span> </div>
<div class="line"><a id="l00162" name="l00162"></a><span class="lineno">  162</span><span class="keyword">private</span>:</div>
<div class="line"><a id="l00163" name="l00163"></a><span class="lineno">  163</span>  <span class="comment">// Types.</span></div>
<div class="line"><a id="l00164" name="l00164"></a><span class="lineno">  164</span><span class="comment"></span> </div>
<div class="line"><a id="l00165" name="l00165"></a><span class="lineno">  165</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00166" name="l00166"></a><span class="lineno">  166</span><span class="comment">   * Data store representing a deficit user async-receive request: either one being currently handled</span></div>
<div class="line"><a id="l00167" name="l00167"></a><span class="lineno">  167</span><span class="comment">   * by `m_sync_io` -- which can handle one `m_sync_io.async_receive_*()` at a time, no more -- or</span></div>
<div class="line"><a id="l00168" name="l00168"></a><span class="lineno">  168</span><span class="comment">   * one queued up behind it, if `async_receive_*()` was called before the current one could complete.</span></div>
<div class="line"><a id="l00169" name="l00169"></a><span class="lineno">  169</span><span class="comment">   *</span></div>
<div class="line"><a id="l00170" name="l00170"></a><span class="lineno">  170</span><span class="comment">   * Essentially this stores args to async_receive_native_handle() (or degenerate version, async_receive_blob())</span></div>
<div class="line"><a id="l00171" name="l00171"></a><span class="lineno">  171</span><span class="comment">   * which is an async-operating method.  We store them in queue via #Ptr.</span></div>
<div class="line"><a id="l00172" name="l00172"></a><span class="lineno">  172</span><span class="comment">   */</span></div>
<div class="line"><a id="l00173" name="l00173"></a><span class="lineno"><a class="line" href="structipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver_1_1User__request.html">  173</a></span>  <span class="keyword">struct </span><a class="code hl_struct" href="structipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver_1_1User__request.html">User_request</a></div>
<div class="line"><a id="l00174" name="l00174"></a><span class="lineno">  174</span>  {</div>
<div class="line"><a id="l00175" name="l00175"></a><span class="lineno">  175</span>    <span class="comment">// Types.</span></div>
<div class="line"><a id="l00176" name="l00176"></a><span class="lineno">  176</span><span class="comment"></span> </div>
<div class="line"><a id="l00177" name="l00177"></a><span class="lineno">  177</span><span class="comment">    /// Short-hand for `unique_ptr` to this.</span></div>
<div class="line"><a id="l00178" name="l00178"></a><span class="lineno"><a class="line" href="structipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver_1_1User__request.html#ad716a5458992596636d5e3e4f9d83e9b">  178</a></span><span class="comment"></span>    <span class="keyword">using </span><a class="code hl_typedef" href="structipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver_1_1User__request.html#ad716a5458992596636d5e3e4f9d83e9b">Ptr</a> = boost::movelib::unique_ptr&lt;User_request&gt;;</div>
<div class="line"><a id="l00179" name="l00179"></a><span class="lineno">  179</span> </div>
<div class="line"><a id="l00180" name="l00180"></a><span class="lineno">  180</span>    <span class="comment">// Data.</span></div>
<div class="line"><a id="l00181" name="l00181"></a><span class="lineno">  181</span><span class="comment"></span> </div>
<div class="line"><a id="l00182" name="l00182"></a><span class="lineno">  182</span><span class="comment">    /// See async_receive_native_handle() `target_hndl`.  Null for `async_receive_blob()`.</span></div>
<div class="line"><a id="l00183" name="l00183"></a><span class="lineno"><a class="line" href="structipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver_1_1User__request.html#a2d0ba069841a0d43bb5c173f9b4ea0b5">  183</a></span><span class="comment"></span>    <a class="code hl_struct" href="structipc_1_1util_1_1Native__handle.html">Native_handle</a>* <a class="code hl_variable" href="structipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver_1_1User__request.html#a2d0ba069841a0d43bb5c173f9b4ea0b5">m_target_hndl_ptr</a>;</div>
<div class="line"><a id="l00184" name="l00184"></a><span class="lineno">  184</span><span class="comment"></span> </div>
<div class="line"><a id="l00185" name="l00185"></a><span class="lineno">  185</span><span class="comment">    /// See async_receive_native_handle() `target_meta_blob`.  Or see async_receive_blob() `target_blob`.</span></div>
<div class="line"><a id="l00186" name="l00186"></a><span class="lineno"><a class="line" href="structipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver_1_1User__request.html#a8071b7e47453d21bd86665c15af7949d">  186</a></span><span class="comment"></span>    <a class="code hl_typedef" href="namespaceipc_1_1util.html#a6cb62ae434900f3a8915b33ec5d61a96">util::Blob_mutable</a> <a class="code hl_variable" href="structipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver_1_1User__request.html#a8071b7e47453d21bd86665c15af7949d">m_target_meta_blob</a>;</div>
<div class="line"><a id="l00187" name="l00187"></a><span class="lineno">  187</span><span class="comment"></span> </div>
<div class="line"><a id="l00188" name="l00188"></a><span class="lineno">  188</span><span class="comment">    /// See async_receive_native_handle() or async_receive_blob() `on_done_func`.</span></div>
<div class="line"><a id="l00189" name="l00189"></a><span class="lineno"><a class="line" href="structipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver_1_1User__request.html#ae115cdc89f6f07b72908be17bbde3208">  189</a></span><span class="comment"></span>    flow::async::Task_asio_err_sz <a class="code hl_variable" href="structipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver_1_1User__request.html#ae115cdc89f6f07b72908be17bbde3208">m_on_done_func</a>;</div>
<div class="line"><a id="l00190" name="l00190"></a><span class="lineno">  190</span>  }; <span class="comment">// struct User_request</span></div>
<div class="line"><a id="l00191" name="l00191"></a><span class="lineno">  191</span> </div>
<div class="line"><a id="l00192" name="l00192"></a><span class="lineno">  192</span>  <span class="comment">// Methods.</span></div>
<div class="line"><a id="l00193" name="l00193"></a><span class="lineno">  193</span><span class="comment"></span> </div>
<div class="line"><a id="l00194" name="l00194"></a><span class="lineno">  194</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00195" name="l00195"></a><span class="lineno">  195</span><span class="comment">   * Body of async_receive_native_handle() and async_receive_blob(); with `target_hndl` null if and only if</span></div>
<div class="line"><a id="l00196" name="l00196"></a><span class="lineno">  196</span><span class="comment">   * it&#39;s the latter as opposed to the former.</span></div>
<div class="line"><a id="l00197" name="l00197"></a><span class="lineno">  197</span><span class="comment">   *</span></div>
<div class="line"><a id="l00198" name="l00198"></a><span class="lineno">  198</span><span class="comment">   * @param target_hndl_or_null</span></div>
<div class="line"><a id="l00199" name="l00199"></a><span class="lineno">  199</span><span class="comment">   *        See async_receive_native_handle(); or null if it&#39;s the other API.</span></div>
<div class="line"><a id="l00200" name="l00200"></a><span class="lineno">  200</span><span class="comment">   *        If `!(Core::S_TRANSMIT_NATIVE_HANDLES)` this must be null.</span></div>
<div class="line"><a id="l00201" name="l00201"></a><span class="lineno">  201</span><span class="comment">   * @param target_meta_blob</span></div>
<div class="line"><a id="l00202" name="l00202"></a><span class="lineno">  202</span><span class="comment">   *        See async_receive_native_handle().</span></div>
<div class="line"><a id="l00203" name="l00203"></a><span class="lineno">  203</span><span class="comment">   * @param on_done_func</span></div>
<div class="line"><a id="l00204" name="l00204"></a><span class="lineno">  204</span><span class="comment">   *        See async_receive_native_handle().</span></div>
<div class="line"><a id="l00205" name="l00205"></a><span class="lineno">  205</span><span class="comment">   */</span></div>
<div class="line"><a id="l00206" name="l00206"></a><span class="lineno">  206</span>  <span class="keywordtype">void</span> <a class="code hl_function" href="classipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver.html#a6cf425ab8e3258924e6d1db12da2fbf5">async_receive_native_handle_impl</a>(<a class="code hl_struct" href="structipc_1_1util_1_1Native__handle.html">Native_handle</a>* target_hndl_or_null,</div>
<div class="line"><a id="l00207" name="l00207"></a><span class="lineno">  207</span>                                        <span class="keyword">const</span> <a class="code hl_typedef" href="namespaceipc_1_1util.html#a6cb62ae434900f3a8915b33ec5d61a96">util::Blob_mutable</a>&amp; target_meta_blob,</div>
<div class="line"><a id="l00208" name="l00208"></a><span class="lineno">  208</span>                                        flow::async::Task_asio_err_sz&amp;&amp; on_done_func);</div>
<div class="line"><a id="l00209" name="l00209"></a><span class="lineno">  209</span><span class="comment"></span> </div>
<div class="line"><a id="l00210" name="l00210"></a><span class="lineno">  210</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00211" name="l00211"></a><span class="lineno">  211</span><span class="comment">   * Invoked via active-event API, handles the async completion</span></div>
<div class="line"><a id="l00212" name="l00212"></a><span class="lineno">  212</span><span class="comment">   * of `m_sync_io.async_receive_*()` operation.  Can be invoked from thread W only, and #m_mutex must be</span></div>
<div class="line"><a id="l00213" name="l00213"></a><span class="lineno">  213</span><span class="comment">   * locked.  #m_user_request must not be null.</span></div>
<div class="line"><a id="l00214" name="l00214"></a><span class="lineno">  214</span><span class="comment">   *</span></div>
<div class="line"><a id="l00215" name="l00215"></a><span class="lineno">  215</span><span class="comment">   * This method iteratively, synchronously leverages #m_sync_io to read as many in-messages available</span></div>
<div class="line"><a id="l00216" name="l00216"></a><span class="lineno">  216</span><span class="comment">   * in the transport as possible, until: the request deficit is met (either by reading enough messages</span></div>
<div class="line"><a id="l00217" name="l00217"></a><span class="lineno">  217</span><span class="comment">   * to satisfy #m_user_request and #m_pending_user_requests_q; or by encountering pipe-hosing error)</span></div>
<div class="line"><a id="l00218" name="l00218"></a><span class="lineno">  218</span><span class="comment">   * or would-block.  In the latter case another async-wait is initiated by this method synchronously.</span></div>
<div class="line"><a id="l00219" name="l00219"></a><span class="lineno">  219</span><span class="comment">   *</span></div>
<div class="line"><a id="l00220" name="l00220"></a><span class="lineno">  220</span><span class="comment">   * The first action, before those potential further reads, is to process_msg_or_error() the just-received</span></div>
<div class="line"><a id="l00221" name="l00221"></a><span class="lineno">  221</span><span class="comment">   * (or pipe-hosing would-be) message.  Then for each further in-message process_msg_or_error() is again</span></div>
<div class="line"><a id="l00222" name="l00222"></a><span class="lineno">  222</span><span class="comment">   * invoked.</span></div>
<div class="line"><a id="l00223" name="l00223"></a><span class="lineno">  223</span><span class="comment">   *</span></div>
<div class="line"><a id="l00224" name="l00224"></a><span class="lineno">  224</span><span class="comment">   * For each request satisfied, a separate user handler is posted onto thread W to execute in order.</span></div>
<div class="line"><a id="l00225" name="l00225"></a><span class="lineno">  225</span><span class="comment">   *</span></div>
<div class="line"><a id="l00226" name="l00226"></a><span class="lineno">  226</span><span class="comment">   * @param err_code</span></div>
<div class="line"><a id="l00227" name="l00227"></a><span class="lineno">  227</span><span class="comment">   *        Result to pass to user (if truthy, all pending requests; else to #m_user_request only).</span></div>
<div class="line"><a id="l00228" name="l00228"></a><span class="lineno">  228</span><span class="comment">   * @param sz</span></div>
<div class="line"><a id="l00229" name="l00229"></a><span class="lineno">  229</span><span class="comment">   *        Result to pass to user (ditto).</span></div>
<div class="line"><a id="l00230" name="l00230"></a><span class="lineno">  230</span><span class="comment">   */</span></div>
<div class="line"><a id="l00231" name="l00231"></a><span class="lineno">  231</span>  <span class="keywordtype">void</span> <a class="code hl_function" href="classipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver.html#a98d7b3caa0f0b00c75671278e7971017">on_sync_io_rcv_done</a>(<span class="keyword">const</span> <a class="code hl_typedef" href="namespaceipc.html#aa3192e586cc45d3e7c22463bf2760f89">Error_code</a>&amp; err_code, <span class="keywordtype">size_t</span> sz);</div>
<div class="line"><a id="l00232" name="l00232"></a><span class="lineno">  232</span><span class="comment"></span> </div>
<div class="line"><a id="l00233" name="l00233"></a><span class="lineno">  233</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00234" name="l00234"></a><span class="lineno">  234</span><span class="comment">   * Invoked from thread U/W (async_receive_native_handle_impl()) or thread W (active-event API), handles</span></div>
<div class="line"><a id="l00235" name="l00235"></a><span class="lineno">  235</span><span class="comment">   * a completed `m_sync_io.async_receive_*()` -- whose results are to be given as args -- by (1) updating</span></div>
<div class="line"><a id="l00236" name="l00236"></a><span class="lineno">  236</span><span class="comment">   * #m_user_request and #m_pending_user_requests_q and (2) posting any appropriate handlers onto thread W.</span></div>
<div class="line"><a id="l00237" name="l00237"></a><span class="lineno">  237</span><span class="comment">   *</span></div>
<div class="line"><a id="l00238" name="l00238"></a><span class="lineno">  238</span><span class="comment">   * See notes for on_sync_io_rcv_done().</span></div>
<div class="line"><a id="l00239" name="l00239"></a><span class="lineno">  239</span><span class="comment">   *</span></div>
<div class="line"><a id="l00240" name="l00240"></a><span class="lineno">  240</span><span class="comment">   * @param err_code</span></div>
<div class="line"><a id="l00241" name="l00241"></a><span class="lineno">  241</span><span class="comment">   *        See on_sync_io_rcv_done().</span></div>
<div class="line"><a id="l00242" name="l00242"></a><span class="lineno">  242</span><span class="comment">   * @param sz</span></div>
<div class="line"><a id="l00243" name="l00243"></a><span class="lineno">  243</span><span class="comment">   *        See on_sync_io_rcv_done().</span></div>
<div class="line"><a id="l00244" name="l00244"></a><span class="lineno">  244</span><span class="comment">   */</span></div>
<div class="line"><a id="l00245" name="l00245"></a><span class="lineno">  245</span>  <span class="keywordtype">void</span> <a class="code hl_function" href="classipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver.html#afa5b0ab6ad54e0d3c93550226bfe2b33">process_msg_or_error</a>(<span class="keyword">const</span> <a class="code hl_typedef" href="namespaceipc.html#aa3192e586cc45d3e7c22463bf2760f89">Error_code</a>&amp; err_code, <span class="keywordtype">size_t</span> sz);</div>
<div class="line"><a id="l00246" name="l00246"></a><span class="lineno">  246</span> </div>
<div class="line"><a id="l00247" name="l00247"></a><span class="lineno">  247</span>  <span class="comment">// Data.</span></div>
<div class="line"><a id="l00248" name="l00248"></a><span class="lineno">  248</span><span class="comment"></span> </div>
<div class="line"><a id="l00249" name="l00249"></a><span class="lineno">  249</span><span class="comment">  /// See `log_pfx` arg of ctor.</span></div>
<div class="line"><a id="l00250" name="l00250"></a><span class="lineno"><a class="line" href="classipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver.html#a5dd1bf37b817a3ebbb968d34f0d240b1">  250</a></span><span class="comment"></span>  <span class="keyword">const</span> std::string <a class="code hl_variable" href="classipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver.html#a5dd1bf37b817a3ebbb968d34f0d240b1">m_log_pfx</a>;</div>
<div class="line"><a id="l00251" name="l00251"></a><span class="lineno">  251</span><span class="comment"></span> </div>
<div class="line"><a id="l00252" name="l00252"></a><span class="lineno">  252</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00253" name="l00253"></a><span class="lineno">  253</span><span class="comment">   * The *head slot* containing the currently-being-serviced &quot;deficit&quot; async-receive request, with a meta-blob</span></div>
<div class="line"><a id="l00254" name="l00254"></a><span class="lineno">  254</span><span class="comment">   * *potentially* being async-written to; null if there is no pending async_receive_native_handle().</span></div>
<div class="line"><a id="l00255" name="l00255"></a><span class="lineno">  255</span><span class="comment">   * It is the &quot;fulcrum&quot; of the consumer-producer state machine described in doc header impl section&#39;s design</span></div>
<div class="line"><a id="l00256" name="l00256"></a><span class="lineno">  256</span><span class="comment">   * discussion: If null there is no deficit; if not null there is an *overall deficit*.  In the former case,</span></div>
<div class="line"><a id="l00257" name="l00257"></a><span class="lineno">  257</span><span class="comment">   * at steady state, `m_pending_user_requests_q.empty() == true`.</span></div>
<div class="line"><a id="l00258" name="l00258"></a><span class="lineno">  258</span><span class="comment">   *</span></div>
<div class="line"><a id="l00259" name="l00259"></a><span class="lineno">  259</span><span class="comment">   * Protected by #m_mutex.</span></div>
<div class="line"><a id="l00260" name="l00260"></a><span class="lineno">  260</span><span class="comment">   *</span></div>
<div class="line"><a id="l00261" name="l00261"></a><span class="lineno">  261</span><span class="comment">   * @see #m_pending_user_requests_q</span></div>
<div class="line"><a id="l00262" name="l00262"></a><span class="lineno">  262</span><span class="comment">   */</span></div>
<div class="line"><a id="l00263" name="l00263"></a><span class="lineno"><a class="line" href="classipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver.html#a76d81cb59e1b91c7f379064dd285aa93">  263</a></span>  <span class="keyword">typename</span> <a class="code hl_typedef" href="structipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver_1_1User__request.html#ad716a5458992596636d5e3e4f9d83e9b">User_request::Ptr</a> <a class="code hl_variable" href="classipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver.html#a76d81cb59e1b91c7f379064dd285aa93">m_user_request</a>;</div>
<div class="line"><a id="l00264" name="l00264"></a><span class="lineno">  264</span><span class="comment"></span> </div>
<div class="line"><a id="l00265" name="l00265"></a><span class="lineno">  265</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00266" name="l00266"></a><span class="lineno">  266</span><span class="comment">   * Queue storing deficit async-receive requests queued up due to #m_user_request being not null while</span></div>
<div class="line"><a id="l00267" name="l00267"></a><span class="lineno">  267</span><span class="comment">   * more `async_receive_*()` invocations being made by user.  One can think of the &quot;overall&quot; queue as being</span></div>
<div class="line"><a id="l00268" name="l00268"></a><span class="lineno">  268</span><span class="comment">   * #m_user_request followed by the elements in this #m_pending_user_requests_q.</span></div>
<div class="line"><a id="l00269" name="l00269"></a><span class="lineno">  269</span><span class="comment">   * See class doc header for design discussion.</span></div>
<div class="line"><a id="l00270" name="l00270"></a><span class="lineno">  270</span><span class="comment">   *</span></div>
<div class="line"><a id="l00271" name="l00271"></a><span class="lineno">  271</span><span class="comment">   * Protected by #m_mutex.</span></div>
<div class="line"><a id="l00272" name="l00272"></a><span class="lineno">  272</span><span class="comment">   *</span></div>
<div class="line"><a id="l00273" name="l00273"></a><span class="lineno">  273</span><span class="comment">   * ### Rationale for not subsuming #m_user_request directly into this queue ###</span></div>
<div class="line"><a id="l00274" name="l00274"></a><span class="lineno">  274</span><span class="comment">   * It&#39;s the same amount of stuff; so the reason is stylistic in a subjective way.  Basically a low-level</span></div>
<div class="line"><a id="l00275" name="l00275"></a><span class="lineno">  275</span><span class="comment">   * async read-op will target the meta-blob *directly* inside the head User_request in the &quot;overall&quot; queue but</span></div>
<div class="line"><a id="l00276" name="l00276"></a><span class="lineno">  276</span><span class="comment">   * never any of the subsequently queued requests; in my (ygoldfel) view it is clearer to express it as always</span></div>
<div class="line"><a id="l00277" name="l00277"></a><span class="lineno">  277</span><span class="comment">   * targeting #m_user_request rather than `*(m_pending_user_requests_q.front())`.</span></div>
<div class="line"><a id="l00278" name="l00278"></a><span class="lineno">  278</span><span class="comment">   */</span></div>
<div class="line"><a id="l00279" name="l00279"></a><span class="lineno"><a class="line" href="classipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver.html#a13a636ca275a188bd3727e2d7c247f0e">  279</a></span>  std::queue&lt;typename User_request::Ptr&gt; <a class="code hl_variable" href="classipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver.html#a13a636ca275a188bd3727e2d7c247f0e">m_pending_user_requests_q</a>;</div>
<div class="line"><a id="l00280" name="l00280"></a><span class="lineno">  280</span><span class="comment"></span> </div>
<div class="line"><a id="l00281" name="l00281"></a><span class="lineno">  281</span><span class="comment">  /// Protects #m_user_request, #m_pending_user_requests_q, and receive-ops data of #m_sync_io.</span></div>
<div class="line"><a id="l00282" name="l00282"></a><span class="lineno"><a class="line" href="classipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver.html#a113a43c175209f7e3293f75ab4bcd794">  282</a></span><span class="comment"></span>  <span class="keyword">mutable</span> flow::util::Mutex_non_recursive <a class="code hl_variable" href="classipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver.html#a113a43c175209f7e3293f75ab4bcd794">m_mutex</a>;</div>
<div class="line"><a id="l00283" name="l00283"></a><span class="lineno">  283</span><span class="comment"></span> </div>
<div class="line"><a id="l00284" name="l00284"></a><span class="lineno">  284</span><span class="comment">  /// Single-thread worker pool for all internal async work.  Referred to as thread W in comments.</span></div>
<div class="line"><a id="l00285" name="l00285"></a><span class="lineno"><a class="line" href="classipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver.html#a0df3c0d0291cb4d3ea7fbd8214a12cb8">  285</a></span><span class="comment"></span>  flow::async::Single_thread_task_loop&amp; <a class="code hl_variable" href="classipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver.html#a0df3c0d0291cb4d3ea7fbd8214a12cb8">m_worker</a>;</div>
<div class="line"><a id="l00286" name="l00286"></a><span class="lineno">  286</span><span class="comment"></span> </div>
<div class="line"><a id="l00287" name="l00287"></a><span class="lineno">  287</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00288" name="l00288"></a><span class="lineno">  288</span><span class="comment">   * The core #Core engine, implementing the `sync_io` pattern (see util::sync_io doc header).</span></div>
<div class="line"><a id="l00289" name="l00289"></a><span class="lineno">  289</span><span class="comment">   * See our class doc header for overview of how we use it (the aforementioned `sync_io` doc header talks about</span></div>
<div class="line"><a id="l00290" name="l00290"></a><span class="lineno">  290</span><span class="comment">   * the `sync_io` pattern generally).</span></div>
<div class="line"><a id="l00291" name="l00291"></a><span class="lineno">  291</span><span class="comment">   *</span></div>
<div class="line"><a id="l00292" name="l00292"></a><span class="lineno">  292</span><span class="comment">   * Thus, #m_sync_io is the synchronous engine that we use to perform our work in our asynchronous boost.asio</span></div>
<div class="line"><a id="l00293" name="l00293"></a><span class="lineno">  293</span><span class="comment">   * loop running in thread W (#m_worker) while collaborating with user thread(s) a/k/a thread U.</span></div>
<div class="line"><a id="l00294" name="l00294"></a><span class="lineno">  294</span><span class="comment">   * (Recall that the user may choose to set up their own event loop/thread(s) --</span></div>
<div class="line"><a id="l00295" name="l00295"></a><span class="lineno">  295</span><span class="comment">   * boost.asio-based or otherwise -- and use their own equivalent of an #m_sync_io instead.)</span></div>
<div class="line"><a id="l00296" name="l00296"></a><span class="lineno">  296</span><span class="comment">   */</span></div>
<div class="line"><a id="l00297" name="l00297"></a><span class="lineno"><a class="line" href="classipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver.html#af07534b8b9beb4e47b1af513d82d7460">  297</a></span>  <a class="code hl_typedef" href="classipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver.html#aeb37be595e9cfce9e0185acee7eeac80">Core</a>&amp; <a class="code hl_variable" href="classipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver.html#af07534b8b9beb4e47b1af513d82d7460">m_sync_io</a>;</div>
<div class="line"><a id="l00298" name="l00298"></a><span class="lineno">  298</span>}; <span class="comment">// class Async_adapter_receiver</span></div>
<div class="line"><a id="l00299" name="l00299"></a><span class="lineno">  299</span> </div>
<div class="line"><a id="l00300" name="l00300"></a><span class="lineno">  300</span><span class="comment">// Template implementations.</span></div>
<div class="line"><a id="l00301" name="l00301"></a><span class="lineno">  301</span> </div>
<div class="line"><a id="l00302" name="l00302"></a><span class="lineno">  302</span><span class="keyword">template</span>&lt;<span class="keyword">typename</span> Core_t&gt;</div>
<div class="line"><a id="l00303" name="l00303"></a><span class="lineno"><a class="line" href="classipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver.html#a2f32f38020a0d21499b1c0b724ff332b">  303</a></span><a class="code hl_function" href="classipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver.html#a2f32f38020a0d21499b1c0b724ff332b">Async_adapter_receiver&lt;Core_t&gt;::Async_adapter_receiver</a>(flow::log::Logger* logger_ptr,</div>
<div class="line"><a id="l00304" name="l00304"></a><span class="lineno">  304</span>                                                       <a class="code hl_typedef" href="namespaceipc_1_1util.html#ae6ac47812a90d1287c61e0b7de7bc4f5">util::String_view</a> log_pfx,</div>
<div class="line"><a id="l00305" name="l00305"></a><span class="lineno">  305</span>                                                       flow::async::Single_thread_task_loop* worker,</div>
<div class="line"><a id="l00306" name="l00306"></a><span class="lineno">  306</span>                                                       <a class="code hl_typedef" href="classipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver.html#aeb37be595e9cfce9e0185acee7eeac80">Core</a>* sync_io) :</div>
<div class="line"><a id="l00307" name="l00307"></a><span class="lineno">  307</span>  flow::log::Log_context(logger_ptr, <a class="code hl_enumeration" href="namespaceipc.html#a4ccdeed058222c635745a4dc830e99f7">Log_component</a>::S_TRANSPORT),</div>
<div class="line"><a id="l00308" name="l00308"></a><span class="lineno">  308</span>  m_log_pfx(log_pfx),</div>
<div class="line"><a id="l00309" name="l00309"></a><span class="lineno">  309</span>  m_worker(*worker),</div>
<div class="line"><a id="l00310" name="l00310"></a><span class="lineno">  310</span>  m_sync_io(*sync_io)</div>
<div class="line"><a id="l00311" name="l00311"></a><span class="lineno">  311</span>{</div>
<div class="line"><a id="l00312" name="l00312"></a><span class="lineno">  312</span>  <span class="keyword">using </span><a class="code hl_class" href="classipc_1_1util_1_1sync__io_1_1Asio__waitable__native__handle.html">util::sync_io::Asio_waitable_native_handle</a>;</div>
<div class="line"><a id="l00313" name="l00313"></a><span class="lineno">  313</span>  <span class="keyword">using </span><a class="code hl_typedef" href="namespaceipc_1_1util_1_1sync__io.html#ac6973c71fc70c6d867b0f2255c642532">util::sync_io::Task_ptr</a>;</div>
<div class="line"><a id="l00314" name="l00314"></a><span class="lineno">  314</span>  <span class="keyword">using </span>flow::util::Lock_guard;</div>
<div class="line"><a id="l00315" name="l00315"></a><span class="lineno">  315</span> </div>
<div class="line"><a id="l00316" name="l00316"></a><span class="lineno">  316</span>  <span class="comment">// We&#39;ve just entered PEER state, so set up the receive-ops.</span></div>
<div class="line"><a id="l00317" name="l00317"></a><span class="lineno">  317</span> </div>
<div class="line"><a id="l00318" name="l00318"></a><span class="lineno">  318</span>  <span class="comment">/* Hook up the m_sync_io=&gt;*this interaction.  m_sync_io will use these callbacks to ask</span></div>
<div class="line"><a id="l00319" name="l00319"></a><span class="lineno">  319</span><span class="comment">   * us to -&gt;async_wait() on `Asio_waitable_native_handle`s for it.</span></div>
<div class="line"><a id="l00320" name="l00320"></a><span class="lineno">  320</span><span class="comment">   *</span></div>
<div class="line"><a id="l00321" name="l00321"></a><span class="lineno">  321</span><span class="comment">   * The *this=&gt;m_sync_io interaction shall be our APIs, like async_receive_native_handle(),</span></div>
<div class="line"><a id="l00322" name="l00322"></a><span class="lineno">  322</span><span class="comment">   * simply invoking the same API in m_sync_io (m_sync_io.async_receive_native_handle() for that example). */</span></div>
<div class="line"><a id="l00323" name="l00323"></a><span class="lineno">  323</span> </div>
<div class="line"><a id="l00324" name="l00324"></a><span class="lineno">  324</span>  <span class="comment">/* (.start_receive_native_handler_ops() would do the same thing, if it exists.  If it exists, that&#39;s because it has</span></div>
<div class="line"><a id="l00325" name="l00325"></a><span class="lineno">  325</span><span class="comment">   * both to satisfy two concepts -- for when the user uses the sync_io::X directly -- but we don&#39;t care about that;</span></div>
<div class="line"><a id="l00326" name="l00326"></a><span class="lineno">  326</span><span class="comment">   * we know they are the same in this case; so just use the one we know exists for any X.) */</span></div>
<div class="line"><a id="l00327" name="l00327"></a><span class="lineno">  327</span><span class="preprocessor">#ifndef NDEBUG</span></div>
<div class="line"><a id="l00328" name="l00328"></a><span class="lineno">  328</span>  <span class="keyword">const</span> <span class="keywordtype">bool</span> ok =</div>
<div class="line"><a id="l00329" name="l00329"></a><span class="lineno">  329</span><span class="preprocessor">#endif</span></div>
<div class="line"><a id="l00330" name="l00330"></a><span class="lineno">  330</span>  <a class="code hl_variable" href="classipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver.html#af07534b8b9beb4e47b1af513d82d7460">m_sync_io</a>.start_receive_blob_ops([<span class="keyword">this</span>](Asio_waitable_native_handle* hndl_of_interest,</div>
<div class="line"><a id="l00331" name="l00331"></a><span class="lineno">  331</span>                                          <span class="keywordtype">bool</span> ev_of_interest_snd_else_rcv,</div>
<div class="line"><a id="l00332" name="l00332"></a><span class="lineno">  332</span>                                          <a class="code hl_typedef" href="namespaceipc_1_1util_1_1sync__io.html#ac6973c71fc70c6d867b0f2255c642532">Task_ptr</a>&amp;&amp; on_active_ev_func)</div>
<div class="line"><a id="l00333" name="l00333"></a><span class="lineno">  333</span>  {</div>
<div class="line"><a id="l00334" name="l00334"></a><span class="lineno">  334</span>    <span class="comment">/* We are in thread U or thread W; m_sync_io.&lt;?&gt;() has called its m_..._ev_wait_func();</span></div>
<div class="line"><a id="l00335" name="l00335"></a><span class="lineno">  335</span><span class="comment">     * it has protected access to *hndl_of_interest as needed. */</span></div>
<div class="line"><a id="l00336" name="l00336"></a><span class="lineno">  336</span> </div>
<div class="line"><a id="l00337" name="l00337"></a><span class="lineno">  337</span>    FLOW_LOG_TRACE(<a class="code hl_variable" href="classipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver.html#a5dd1bf37b817a3ebbb968d34f0d240b1">m_log_pfx</a> &lt;&lt; <span class="stringliteral">&quot;: Sync-IO receive-ops event-wait request: &quot;</span></div>
<div class="line"><a id="l00338" name="l00338"></a><span class="lineno">  338</span>                   <span class="stringliteral">&quot;descriptor [&quot;</span> &lt;&lt; hndl_of_interest-&gt;native_handle() &lt;&lt; <span class="stringliteral">&quot;], &quot;</span></div>
<div class="line"><a id="l00339" name="l00339"></a><span class="lineno">  339</span>                   <span class="stringliteral">&quot;writable-else-readable [&quot;</span> &lt;&lt; ev_of_interest_snd_else_rcv &lt;&lt; <span class="stringliteral">&quot;].&quot;</span>);</div>
<div class="line"><a id="l00340" name="l00340"></a><span class="lineno">  340</span> </div>
<div class="line"><a id="l00341" name="l00341"></a><span class="lineno">  341</span>    <span class="comment">// They want this async_wait().  Oblige.</span></div>
<div class="line"><a id="l00342" name="l00342"></a><span class="lineno">  342</span>    assert(hndl_of_interest);</div>
<div class="line"><a id="l00343" name="l00343"></a><span class="lineno">  343</span>    hndl_of_interest-&gt;async_wait(ev_of_interest_snd_else_rcv</div>
<div class="line"><a id="l00344" name="l00344"></a><span class="lineno">  344</span>                                   ? Asio_waitable_native_handle::Base::wait_write</div>
<div class="line"><a id="l00345" name="l00345"></a><span class="lineno">  345</span>                                   : Asio_waitable_native_handle::Base::wait_read,</div>
<div class="line"><a id="l00346" name="l00346"></a><span class="lineno">  346</span>                                 [<span class="keyword">this</span>, on_active_ev_func = std::move(on_active_ev_func)]</div>
<div class="line"><a id="l00347" name="l00347"></a><span class="lineno">  347</span>                                   (<span class="keyword">const</span> <a class="code hl_typedef" href="namespaceipc.html#aa3192e586cc45d3e7c22463bf2760f89">Error_code</a>&amp; err_code)</div>
<div class="line"><a id="l00348" name="l00348"></a><span class="lineno">  348</span>    {</div>
<div class="line"><a id="l00349" name="l00349"></a><span class="lineno">  349</span>      <span class="comment">// We are in thread W.  Nothing is locked.</span></div>
<div class="line"><a id="l00350" name="l00350"></a><span class="lineno">  350</span> </div>
<div class="line"><a id="l00351" name="l00351"></a><span class="lineno">  351</span>      <span class="keywordflow">if</span> (err_code == boost::asio::error::operation_aborted)</div>
<div class="line"><a id="l00352" name="l00352"></a><span class="lineno">  352</span>      {</div>
<div class="line"><a id="l00353" name="l00353"></a><span class="lineno">  353</span>        <span class="keywordflow">return</span>; <span class="comment">// Stuff is shutting down.  GTFO.</span></div>
<div class="line"><a id="l00354" name="l00354"></a><span class="lineno">  354</span>      }</div>
<div class="line"><a id="l00355" name="l00355"></a><span class="lineno">  355</span>      <span class="comment">// else</span></div>
<div class="line"><a id="l00356" name="l00356"></a><span class="lineno">  356</span> </div>
<div class="line"><a id="l00357" name="l00357"></a><span class="lineno">  357</span>      <span class="comment">// They want to know about completed async_wait().  Oblige.</span></div>
<div class="line"><a id="l00358" name="l00358"></a><span class="lineno">  358</span> </div>
<div class="line"><a id="l00359" name="l00359"></a><span class="lineno">  359</span>      <span class="comment">// Protect m_sync_io and non-const non-ref m_* against receive-ops (async_receive_*(), ...).</span></div>
<div class="line"><a id="l00360" name="l00360"></a><span class="lineno">  360</span>      Lock_guard&lt;<span class="keyword">decltype</span>(<a class="code hl_variable" href="classipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver.html#a113a43c175209f7e3293f75ab4bcd794">m_mutex</a>)&gt; lock(<a class="code hl_variable" href="classipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver.html#a113a43c175209f7e3293f75ab4bcd794">m_mutex</a>);</div>
<div class="line"><a id="l00361" name="l00361"></a><span class="lineno">  361</span> </div>
<div class="line"><a id="l00362" name="l00362"></a><span class="lineno">  362</span>      <span class="comment">/* Inform m_sync_io of the event.  This can synchronously invoke handler we have registered via m_sync_io</span></div>
<div class="line"><a id="l00363" name="l00363"></a><span class="lineno">  363</span><span class="comment">       * API (e.g., `send_*()`, auto_ping()).  In our case -- if indeed it triggers a handler -- it will</span></div>
<div class="line"><a id="l00364" name="l00364"></a><span class="lineno">  364</span><span class="comment">       * have to do with async_end_sending() completion. */</span></div>
<div class="line"><a id="l00365" name="l00365"></a><span class="lineno">  365</span> </div>
<div class="line"><a id="l00366" name="l00366"></a><span class="lineno">  366</span>      (*on_active_ev_func)();</div>
<div class="line"><a id="l00367" name="l00367"></a><span class="lineno">  367</span>      <span class="comment">// (That would have logged sufficiently inside m_sync_io; let&#39;s not spam further.)</span></div>
<div class="line"><a id="l00368" name="l00368"></a><span class="lineno">  368</span> </div>
<div class="line"><a id="l00369" name="l00369"></a><span class="lineno">  369</span>      <span class="comment">// Lock_guard&lt;decltype(m_mutex)&gt; lock(m_mutex): unlocks here.</span></div>
<div class="line"><a id="l00370" name="l00370"></a><span class="lineno">  370</span>    }); <span class="comment">// hndl_of_interest-&gt;async_wait()</span></div>
<div class="line"><a id="l00371" name="l00371"></a><span class="lineno">  371</span>  }); <span class="comment">// m_sync_io.start_receive_blob_ops()</span></div>
<div class="line"><a id="l00372" name="l00372"></a><span class="lineno">  372</span>  assert(ok);</div>
<div class="line"><a id="l00373" name="l00373"></a><span class="lineno">  373</span>} <span class="comment">// Async_adapter_receiver::Async_adapter_receiver()</span></div>
<div class="line"><a id="l00374" name="l00374"></a><span class="lineno">  374</span> </div>
<div class="line"><a id="l00375" name="l00375"></a><span class="lineno">  375</span><span class="keyword">template</span>&lt;<span class="keyword">typename</span> Core_t&gt;</div>
<div class="line"><a id="l00376" name="l00376"></a><span class="lineno"><a class="line" href="classipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver.html#a80428aeb0d3f9e836fe897fc1e42601a">  376</a></span><a class="code hl_function" href="classipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver.html#a80428aeb0d3f9e836fe897fc1e42601a">Async_adapter_receiver&lt;Core_t&gt;::~Async_adapter_receiver</a>()</div>
<div class="line"><a id="l00377" name="l00377"></a><span class="lineno">  377</span>{</div>
<div class="line"><a id="l00378" name="l00378"></a><span class="lineno">  378</span>  <span class="keyword">using </span>flow::async::Single_thread_task_loop;</div>
<div class="line"><a id="l00379" name="l00379"></a><span class="lineno">  379</span>  <span class="keyword">using </span>flow::async::reset_thread_pinning;</div>
<div class="line"><a id="l00380" name="l00380"></a><span class="lineno">  380</span>  <span class="keyword">using </span>flow::util::ostream_op_string;</div>
<div class="line"><a id="l00381" name="l00381"></a><span class="lineno">  381</span> </div>
<div class="line"><a id="l00382" name="l00382"></a><span class="lineno">  382</span>  <span class="comment">/* Pre-condition: m_worker is stop()ed, and any pending tasks on it have been executed.</span></div>
<div class="line"><a id="l00383" name="l00383"></a><span class="lineno">  383</span><span class="comment">   * Our promised job is to invoke any pending handlers with operation-aborted.</span></div>
<div class="line"><a id="l00384" name="l00384"></a><span class="lineno">  384</span><span class="comment">   * The decision to do it from a one-off thread is explained in transport::Native_socket_stream::Impl::~Impl()</span></div>
<div class="line"><a id="l00385" name="l00385"></a><span class="lineno">  385</span><span class="comment">   * and used in a few places; so see that.  Let&#39;s just do it.</span></div>
<div class="line"><a id="l00386" name="l00386"></a><span class="lineno">  386</span><span class="comment">   * @todo It would be cool, I guess, to do it all in one one-off thread instead of potentially starting, like,</span></div>
<div class="line"><a id="l00387" name="l00387"></a><span class="lineno">  387</span><span class="comment">   * 3 for some of our customers.  Well, whatever. */</span></div>
<div class="line"><a id="l00388" name="l00388"></a><span class="lineno">  388</span> </div>
<div class="line"><a id="l00389" name="l00389"></a><span class="lineno">  389</span>  <span class="keywordflow">if</span> (m_user_request)</div>
<div class="line"><a id="l00390" name="l00390"></a><span class="lineno">  390</span>  {</div>
<div class="line"><a id="l00391" name="l00391"></a><span class="lineno">  391</span>    Single_thread_task_loop one_thread(get_logger(),</div>
<div class="line"><a id="l00392" name="l00392"></a><span class="lineno">  392</span>                                       ostream_op_string(<span class="stringliteral">&quot;ARcDeinit-&quot;</span>, m_log_pfx));</div>
<div class="line"><a id="l00393" name="l00393"></a><span class="lineno">  393</span>    one_thread.start([&amp;]()</div>
<div class="line"><a id="l00394" name="l00394"></a><span class="lineno">  394</span>    {</div>
<div class="line"><a id="l00395" name="l00395"></a><span class="lineno">  395</span>      reset_thread_pinning(get_logger()); <span class="comment">// Don&#39;t inherit any strange core-affinity.  Float free.</span></div>
<div class="line"><a id="l00396" name="l00396"></a><span class="lineno">  396</span> </div>
<div class="line"><a id="l00397" name="l00397"></a><span class="lineno">  397</span>      FLOW_LOG_TRACE(<span class="stringliteral">&quot;Running head slot async-receive completion handler.&quot;</span>);</div>
<div class="line"><a id="l00398" name="l00398"></a><span class="lineno">  398</span>      m_user_request-&gt;m_on_done_func(<a class="code hl_enumvalue" href="namespaceipc_1_1transport_1_1error.html#adfef15ef4e76cc55d652fbd9c2797297afe29343445a7bf167cc186a44bd2c6ed">error::Code::S_OBJECT_SHUTDOWN_ABORTED_COMPLETION_HANDLER</a>, 0);</div>
<div class="line"><a id="l00399" name="l00399"></a><span class="lineno">  399</span>      FLOW_LOG_TRACE(<span class="stringliteral">&quot;User receive handler finished.&quot;</span>);</div>
<div class="line"><a id="l00400" name="l00400"></a><span class="lineno">  400</span> </div>
<div class="line"><a id="l00401" name="l00401"></a><span class="lineno">  401</span>      <span class="keywordflow">while</span> (!m_pending_user_requests_q.empty())</div>
<div class="line"><a id="l00402" name="l00402"></a><span class="lineno">  402</span>      {</div>
<div class="line"><a id="l00403" name="l00403"></a><span class="lineno">  403</span>        FLOW_LOG_TRACE(<span class="stringliteral">&quot;Running a queued async-receive completion handler.&quot;</span>);</div>
<div class="line"><a id="l00404" name="l00404"></a><span class="lineno">  404</span>        m_pending_user_requests_q.front()</div>
<div class="line"><a id="l00405" name="l00405"></a><span class="lineno">  405</span>          -&gt;m_on_done_func(<a class="code hl_enumvalue" href="namespaceipc_1_1transport_1_1error.html#adfef15ef4e76cc55d652fbd9c2797297afe29343445a7bf167cc186a44bd2c6ed">error::Code::S_OBJECT_SHUTDOWN_ABORTED_COMPLETION_HANDLER</a>, 0);</div>
<div class="line"><a id="l00406" name="l00406"></a><span class="lineno">  406</span>        m_pending_user_requests_q.pop();</div>
<div class="line"><a id="l00407" name="l00407"></a><span class="lineno">  407</span>        FLOW_LOG_TRACE(<span class="stringliteral">&quot;User receive handler finished.  Popped from user request deficit queue.&quot;</span>);</div>
<div class="line"><a id="l00408" name="l00408"></a><span class="lineno">  408</span>      } <span class="comment">// while (!m_pending_user_requests_q.empty())</span></div>
<div class="line"><a id="l00409" name="l00409"></a><span class="lineno">  409</span>    });</div>
<div class="line"><a id="l00410" name="l00410"></a><span class="lineno">  410</span>  } <span class="comment">// if (m_user_request)</span></div>
<div class="line"><a id="l00411" name="l00411"></a><span class="lineno">  411</span>  <span class="keywordflow">else</span></div>
<div class="line"><a id="l00412" name="l00412"></a><span class="lineno">  412</span>  {</div>
<div class="line"><a id="l00413" name="l00413"></a><span class="lineno">  413</span>    assert(m_pending_user_requests_q.empty()); <span class="comment">// Sanity check.</span></div>
<div class="line"><a id="l00414" name="l00414"></a><span class="lineno">  414</span>  }</div>
<div class="line"><a id="l00415" name="l00415"></a><span class="lineno">  415</span>} <span class="comment">// Async_adapter_receiver::~Async_adapter_receiver()</span></div>
<div class="line"><a id="l00416" name="l00416"></a><span class="lineno">  416</span> </div>
<div class="line"><a id="l00417" name="l00417"></a><span class="lineno">  417</span><span class="keyword">template</span>&lt;<span class="keyword">typename</span> Core_t&gt;</div>
<div class="line"><a id="l00418" name="l00418"></a><span class="lineno"><a class="line" href="classipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver.html#abcbc91de36b298c68e5461997a9a0263">  418</a></span><span class="keywordtype">void</span> <a class="code hl_function" href="classipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver.html#abcbc91de36b298c68e5461997a9a0263">Async_adapter_receiver&lt;Core_t&gt;::async_receive_native_handle</a>(<a class="code hl_struct" href="structipc_1_1util_1_1Native__handle.html">Native_handle</a>* target_hndl,</div>
<div class="line"><a id="l00419" name="l00419"></a><span class="lineno">  419</span>                                                                 <span class="keyword">const</span> <a class="code hl_typedef" href="namespaceipc_1_1util.html#a6cb62ae434900f3a8915b33ec5d61a96">util::Blob_mutable</a>&amp; target_meta_blob,</div>
<div class="line"><a id="l00420" name="l00420"></a><span class="lineno">  420</span>                                                                 flow::async::Task_asio_err_sz&amp;&amp; on_done_func)</div>
<div class="line"><a id="l00421" name="l00421"></a><span class="lineno">  421</span>{</div>
<div class="line"><a id="l00422" name="l00422"></a><span class="lineno">  422</span>  assert(target_hndl &amp;&amp; <span class="stringliteral">&quot;Native_socket_stream::async_receive_native_handle() must take non-null Native_handle ptr.&quot;</span>);</div>
<div class="line"><a id="l00423" name="l00423"></a><span class="lineno">  423</span>  async_receive_native_handle_impl(target_hndl, target_meta_blob, std::move(on_done_func));</div>
<div class="line"><a id="l00424" name="l00424"></a><span class="lineno">  424</span> </div>
<div class="line"><a id="l00425" name="l00425"></a><span class="lineno">  425</span>  <span class="comment">/* Note, if our customer lacks async_receive_native_handle(), then they&#39;ll forward to (call) this method;</span></div>
<div class="line"><a id="l00426" name="l00426"></a><span class="lineno">  426</span><span class="comment">   * therefore it (*this being a template instance) will never be compiled; therefore target_hndl_or_null will never</span></div>
<div class="line"><a id="l00427" name="l00427"></a><span class="lineno">  427</span><span class="comment">   * be non-null; which is why that assert(false) inside `if constexpr(!S_TRANSMIT_NATIVE_HANDLES)` compile-time clause</span></div>
<div class="line"><a id="l00428" name="l00428"></a><span class="lineno">  428</span><span class="comment">   * shall never be reached. */</span></div>
<div class="line"><a id="l00429" name="l00429"></a><span class="lineno">  429</span>}</div>
<div class="line"><a id="l00430" name="l00430"></a><span class="lineno">  430</span> </div>
<div class="line"><a id="l00431" name="l00431"></a><span class="lineno">  431</span><span class="keyword">template</span>&lt;<span class="keyword">typename</span> Core_t&gt;</div>
<div class="line"><a id="l00432" name="l00432"></a><span class="lineno"><a class="line" href="classipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver.html#ade3098cb69a47a374cf0354677e2fb0b">  432</a></span><span class="keywordtype">void</span> <a class="code hl_function" href="classipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver.html#ade3098cb69a47a374cf0354677e2fb0b">Async_adapter_receiver&lt;Core_t&gt;::async_receive_blob</a>(<span class="keyword">const</span> <a class="code hl_typedef" href="namespaceipc_1_1util.html#a6cb62ae434900f3a8915b33ec5d61a96">util::Blob_mutable</a>&amp; target_blob,</div>
<div class="line"><a id="l00433" name="l00433"></a><span class="lineno">  433</span>                                                        flow::async::Task_asio_err_sz&amp;&amp; on_done_func)</div>
<div class="line"><a id="l00434" name="l00434"></a><span class="lineno">  434</span>{</div>
<div class="line"><a id="l00435" name="l00435"></a><span class="lineno">  435</span>  async_receive_native_handle_impl(<span class="keyword">nullptr</span>, target_blob, std::move(on_done_func));</div>
<div class="line"><a id="l00436" name="l00436"></a><span class="lineno">  436</span>}</div>
<div class="line"><a id="l00437" name="l00437"></a><span class="lineno">  437</span> </div>
<div class="line"><a id="l00438" name="l00438"></a><span class="lineno">  438</span><span class="keyword">template</span>&lt;<span class="keyword">typename</span> Core_t&gt;</div>
<div class="line"><a id="l00439" name="l00439"></a><span class="lineno"><a class="line" href="classipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver.html#a6cf425ab8e3258924e6d1db12da2fbf5">  439</a></span><span class="keywordtype">void</span> <a class="code hl_function" href="classipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver.html#a6cf425ab8e3258924e6d1db12da2fbf5">Async_adapter_receiver&lt;Core_t&gt;::async_receive_native_handle_impl</a>(<a class="code hl_struct" href="structipc_1_1util_1_1Native__handle.html">Native_handle</a>* target_hndl_or_null,</div>
<div class="line"><a id="l00440" name="l00440"></a><span class="lineno">  440</span>                                                                      <span class="keyword">const</span> <a class="code hl_typedef" href="namespaceipc_1_1util.html#a6cb62ae434900f3a8915b33ec5d61a96">util::Blob_mutable</a>&amp; target_meta_blob,</div>
<div class="line"><a id="l00441" name="l00441"></a><span class="lineno">  441</span>                                                                      flow::async::Task_asio_err_sz&amp;&amp; on_done_func)</div>
<div class="line"><a id="l00442" name="l00442"></a><span class="lineno">  442</span>{</div>
<div class="line"><a id="l00443" name="l00443"></a><span class="lineno">  443</span>  <span class="keyword">using </span>flow::util::Lock_guard;</div>
<div class="line"><a id="l00444" name="l00444"></a><span class="lineno">  444</span>  <span class="keyword">using </span>boost::movelib::make_unique;</div>
<div class="line"><a id="l00445" name="l00445"></a><span class="lineno">  445</span> </div>
<div class="line"><a id="l00446" name="l00446"></a><span class="lineno">  446</span>  <span class="comment">// We are in thread U (or thread W in a completion handler, but not concurrently).</span></div>
<div class="line"><a id="l00447" name="l00447"></a><span class="lineno">  447</span> </div>
<div class="line"><a id="l00448" name="l00448"></a><span class="lineno">  448</span>  <span class="comment">/* We will be accessing m_user_request, m_pending_user_requests_q, and possibly m_sync_io receive-ops</span></div>
<div class="line"><a id="l00449" name="l00449"></a><span class="lineno">  449</span><span class="comment">   * sub-API -- while ctor&#39;s ev-wait function&#39;s async_wait() handler will be accessing them too from thread W -- so: */</span></div>
<div class="line"><a id="l00450" name="l00450"></a><span class="lineno">  450</span> </div>
<div class="line"><a id="l00451" name="l00451"></a><span class="lineno">  451</span>  Lock_guard&lt;<span class="keyword">decltype</span>(m_mutex)&gt; lock(m_mutex);</div>
<div class="line"><a id="l00452" name="l00452"></a><span class="lineno">  452</span> </div>
<div class="line"><a id="l00453" name="l00453"></a><span class="lineno">  453</span>  <span class="comment">/* This is essentially the only place in *this where we&#39;re more than a mere forwarder of the core m_sync_io</span></div>
<div class="line"><a id="l00454" name="l00454"></a><span class="lineno">  454</span><span class="comment">   * sync_io::*_receiver (which is synchronous) into an async *_receiver.  I.e., in this</span></div>
<div class="line"><a id="l00455" name="l00455"></a><span class="lineno">  455</span><span class="comment">   * case we add a feature on top; namely more than 1 async_receive_*() can be pending for us, whereas only</span></div>
<div class="line"><a id="l00456" name="l00456"></a><span class="lineno">  456</span><span class="comment">   * 1 async_receive_*() is allowed in the sync_io one.  We call this is a *deficit*, meaning there are more</span></div>
<div class="line"><a id="l00457" name="l00457"></a><span class="lineno">  457</span><span class="comment">   * user requests than available messages (there&#39;s only ever 1 message &quot;available&quot; -- once the</span></div>
<div class="line"><a id="l00458" name="l00458"></a><span class="lineno">  458</span><span class="comment">   * m_sync_io.async_receive_*() succeeds -- and only momentarily, as it&#39;s immediately fed to the</span></div>
<div class="line"><a id="l00459" name="l00459"></a><span class="lineno">  459</span><span class="comment">   * completion handler of our async_receive_*() that precipitated it.</span></div>
<div class="line"><a id="l00460" name="l00460"></a><span class="lineno">  460</span><span class="comment">   *</span></div>
<div class="line"><a id="l00461" name="l00461"></a><span class="lineno">  461</span><span class="comment">   * Thus, if there is no deficit, and async_receive_*() comes in, we trigger m_sync_io.async_receive_*()</span></div>
<div class="line"><a id="l00462" name="l00462"></a><span class="lineno">  462</span><span class="comment">   * and save the associated request info (basically our 3 args above) into m_user_request.</span></div>
<div class="line"><a id="l00463" name="l00463"></a><span class="lineno">  463</span><span class="comment">   * Once it succeeds we feed the result to the completion handler saved among those 3 args and nullify</span></div>
<div class="line"><a id="l00464" name="l00464"></a><span class="lineno">  464</span><span class="comment">   * m_user_request.  Meanwhile, if another one comes in while there&#39;s already a deficit (m_user_request</span></div>
<div class="line"><a id="l00465" name="l00465"></a><span class="lineno">  465</span><span class="comment">   * is not null), we queue it in m_pending_user_requests_q.  Lastly, having nullified</span></div>
<div class="line"><a id="l00466" name="l00466"></a><span class="lineno">  466</span><span class="comment">   * m_user_request as noted a couple sentences ago, we pop the _q (if not empty) into m_user_request</span></div>
<div class="line"><a id="l00467" name="l00467"></a><span class="lineno">  467</span><span class="comment">   * and trigger another m_sync_io.async_receive_*(), continuing the chain this way until _q is empty</span></div>
<div class="line"><a id="l00468" name="l00468"></a><span class="lineno">  468</span><span class="comment">   * and m_user_request is null (at which point there&#39;s no deficit and not reason to</span></div>
<div class="line"><a id="l00469" name="l00469"></a><span class="lineno">  469</span><span class="comment">   * m_sync_io.async_receive_*()).</span></div>
<div class="line"><a id="l00470" name="l00470"></a><span class="lineno">  470</span><span class="comment">   *</span></div>
<div class="line"><a id="l00471" name="l00471"></a><span class="lineno">  471</span><span class="comment">   * Oh, also, if an m_sync_io.async_receive_*() yields a socket-hosing error, then it is fed to the entire</span></div>
<div class="line"><a id="l00472" name="l00472"></a><span class="lineno">  472</span><span class="comment">   * deficit queue&#39;s handlers; as in any case any subsequent attempted m_sync_io.async_receive_*() would fail.</span></div>
<div class="line"><a id="l00473" name="l00473"></a><span class="lineno">  473</span><span class="comment">   *</span></div>
<div class="line"><a id="l00474" name="l00474"></a><span class="lineno">  474</span><span class="comment">   * Note that there can be a deficit (pending user requests) but no surplus (pending messages): we don&#39;t</span></div>
<div class="line"><a id="l00475" name="l00475"></a><span class="lineno">  475</span><span class="comment">   * make unnecessary m_sync_io.async_receive_*() calls and thus don&#39;t need to save surplus messages.</span></div>
<div class="line"><a id="l00476" name="l00476"></a><span class="lineno">  476</span><span class="comment">   * If we did, we&#39;d need to copy any such surplus message (into user buffer) once this-&gt;async_receive_*() does</span></div>
<div class="line"><a id="l00477" name="l00477"></a><span class="lineno">  477</span><span class="comment">   * come in.  This is discussed and rationalized elsewhere, but for convenience, recap: The reason is, basically,</span></div>
<div class="line"><a id="l00478" name="l00478"></a><span class="lineno">  478</span><span class="comment">   * the send-side concept is obligated to internally copy-and-queue messages on encountering would-block.</span></div>
<div class="line"><a id="l00479" name="l00479"></a><span class="lineno">  479</span><span class="comment">   * Since the system will thus not lose messages (if the receiver side is being slow in popping them from the pipe),</span></div>
<div class="line"><a id="l00480" name="l00480"></a><span class="lineno">  480</span><span class="comment">   * the complexity of queuing stuff -- and the perf loss due to copying -- is kept to one side. */</span></div>
<div class="line"><a id="l00481" name="l00481"></a><span class="lineno">  481</span> </div>
<div class="line"><a id="l00482" name="l00482"></a><span class="lineno">  482</span>  FLOW_LOG_TRACE(m_log_pfx &lt;&lt; <span class="stringliteral">&quot;: Incoming user async-receive request for &quot;</span></div>
<div class="line"><a id="l00483" name="l00483"></a><span class="lineno">  483</span>                 <span class="stringliteral">&quot;possible native handle and meta-blob (located @ [&quot;</span> &lt;&lt; target_meta_blob.data() &lt;&lt; <span class="stringliteral">&quot;] of &quot;</span></div>
<div class="line"><a id="l00484" name="l00484"></a><span class="lineno">  484</span>                 <span class="stringliteral">&quot;max size [&quot;</span> &lt;&lt; target_meta_blob.size() &lt;&lt; <span class="stringliteral">&quot;]).  In worker now? = [&quot;</span> &lt;&lt; m_worker.in_thread() &lt;&lt; <span class="stringliteral">&quot;].&quot;</span>);</div>
<div class="line"><a id="l00485" name="l00485"></a><span class="lineno">  485</span> </div>
<div class="line"><a id="l00486" name="l00486"></a><span class="lineno">  486</span>  <span class="keyword">auto</span> new_user_request = make_unique&lt;User_request&gt;();</div>
<div class="line"><a id="l00487" name="l00487"></a><span class="lineno">  487</span>  new_user_request-&gt;m_target_hndl_ptr = target_hndl_or_null;</div>
<div class="line"><a id="l00488" name="l00488"></a><span class="lineno">  488</span>  new_user_request-&gt;m_target_meta_blob = target_meta_blob;</div>
<div class="line"><a id="l00489" name="l00489"></a><span class="lineno">  489</span>  new_user_request-&gt;m_on_done_func = std::move(on_done_func);</div>
<div class="line"><a id="l00490" name="l00490"></a><span class="lineno">  490</span> </div>
<div class="line"><a id="l00491" name="l00491"></a><span class="lineno">  491</span>  <span class="keywordflow">if</span> (m_user_request)</div>
<div class="line"><a id="l00492" name="l00492"></a><span class="lineno">  492</span>  {</div>
<div class="line"><a id="l00493" name="l00493"></a><span class="lineno">  493</span>    m_pending_user_requests_q.emplace(std::move(new_user_request));</div>
<div class="line"><a id="l00494" name="l00494"></a><span class="lineno">  494</span>    FLOW_LOG_TRACE(<span class="stringliteral">&quot;At least 1 async-receive request is already in progress.  &quot;</span></div>
<div class="line"><a id="l00495" name="l00495"></a><span class="lineno">  495</span>                   <span class="stringliteral">&quot;After registering the new async-receive request: Head slot is non-empty; and &quot;</span></div>
<div class="line"><a id="l00496" name="l00496"></a><span class="lineno">  496</span>                   <span class="stringliteral">&quot;subsequently-pending deficit queue has size [&quot;</span> &lt;&lt; m_pending_user_requests_q.size() &lt;&lt; <span class="stringliteral">&quot;].  &quot;</span></div>
<div class="line"><a id="l00497" name="l00497"></a><span class="lineno">  497</span>                   <span class="stringliteral">&quot;Will sync-IO-receive to handle this request once it reaches the front of that queue.&quot;</span>);</div>
<div class="line"><a id="l00498" name="l00498"></a><span class="lineno">  498</span>    <span class="keywordflow">return</span>;</div>
<div class="line"><a id="l00499" name="l00499"></a><span class="lineno">  499</span>  }</div>
<div class="line"><a id="l00500" name="l00500"></a><span class="lineno">  500</span>  <span class="comment">// else if (!m_user_request):</span></div>
<div class="line"><a id="l00501" name="l00501"></a><span class="lineno">  501</span> </div>
<div class="line"><a id="l00502" name="l00502"></a><span class="lineno">  502</span>  FLOW_LOG_TRACE(<span class="stringliteral">&quot;No async-receive request is currently in progress.  Starting sync-IO-receive chain to service the &quot;</span></div>
<div class="line"><a id="l00503" name="l00503"></a><span class="lineno">  503</span>                 <span class="stringliteral">&quot;new request and any further-queued requests that might appear in the meantime.&quot;</span>);</div>
<div class="line"><a id="l00504" name="l00504"></a><span class="lineno">  504</span>  m_user_request = std::move(new_user_request);</div>
<div class="line"><a id="l00505" name="l00505"></a><span class="lineno">  505</span>  <span class="comment">// new_user_request is now hosed.</span></div>
<div class="line"><a id="l00506" name="l00506"></a><span class="lineno">  506</span> </div>
<div class="line"><a id="l00507" name="l00507"></a><span class="lineno">  507</span>  <span class="comment">/* If receive completes synchronously (there are data pending on the &quot;wire&quot;), these will reflect that.</span></div>
<div class="line"><a id="l00508" name="l00508"></a><span class="lineno">  508</span><span class="comment">   * If not then sync_err_code will indicate would-block. */</span></div>
<div class="line"><a id="l00509" name="l00509"></a><span class="lineno">  509</span>  <a class="code hl_typedef" href="namespaceipc.html#aa3192e586cc45d3e7c22463bf2760f89">Error_code</a> sync_err_code;</div>
<div class="line"><a id="l00510" name="l00510"></a><span class="lineno">  510</span>  <span class="keywordtype">size_t</span> sync_sz;</div>
<div class="line"><a id="l00511" name="l00511"></a><span class="lineno">  511</span> </div>
<div class="line"><a id="l00512" name="l00512"></a><span class="lineno">  512</span><span class="preprocessor">#ifndef NDEBUG</span></div>
<div class="line"><a id="l00513" name="l00513"></a><span class="lineno">  513</span>  <span class="keywordtype">bool</span> ok;</div>
<div class="line"><a id="l00514" name="l00514"></a><span class="lineno">  514</span><span class="preprocessor">#endif</span></div>
<div class="line"><a id="l00515" name="l00515"></a><span class="lineno">  515</span>  <span class="keywordflow">if</span> (m_user_request-&gt;m_target_hndl_ptr)</div>
<div class="line"><a id="l00516" name="l00516"></a><span class="lineno">  516</span>  {</div>
<div class="line"><a id="l00517" name="l00517"></a><span class="lineno">  517</span>    <span class="keywordflow">if</span> <span class="keyword">constexpr</span>(Core::S_TRANSMIT_NATIVE_HANDLES) <span class="comment">// Prevent compile error from code that could never be reached.</span></div>
<div class="line"><a id="l00518" name="l00518"></a><span class="lineno">  518</span>    {</div>
<div class="line"><a id="l00519" name="l00519"></a><span class="lineno">  519</span><span class="preprocessor">#ifndef NDEBUG</span></div>
<div class="line"><a id="l00520" name="l00520"></a><span class="lineno">  520</span>      ok =</div>
<div class="line"><a id="l00521" name="l00521"></a><span class="lineno">  521</span><span class="preprocessor">#endif</span></div>
<div class="line"><a id="l00522" name="l00522"></a><span class="lineno">  522</span>      m_sync_io.async_receive_native_handle(m_user_request-&gt;m_target_hndl_ptr, m_user_request-&gt;m_target_meta_blob,</div>
<div class="line"><a id="l00523" name="l00523"></a><span class="lineno">  523</span>                                            &amp;sync_err_code, &amp;sync_sz,</div>
<div class="line"><a id="l00524" name="l00524"></a><span class="lineno">  524</span>                                            [<span class="keyword">this</span>](<span class="keyword">const</span> <a class="code hl_typedef" href="namespaceipc.html#aa3192e586cc45d3e7c22463bf2760f89">Error_code</a>&amp; err_code, <span class="keywordtype">size_t</span> sz)</div>
<div class="line"><a id="l00525" name="l00525"></a><span class="lineno">  525</span>      {</div>
<div class="line"><a id="l00526" name="l00526"></a><span class="lineno">  526</span>        <span class="comment">// We are in thread W.  m_mutex is locked.</span></div>
<div class="line"><a id="l00527" name="l00527"></a><span class="lineno">  527</span>        on_sync_io_rcv_done(err_code, sz); <span class="comment">// Emit to handler; possibly pop queue and continue chain.</span></div>
<div class="line"><a id="l00528" name="l00528"></a><span class="lineno">  528</span>      });</div>
<div class="line"><a id="l00529" name="l00529"></a><span class="lineno">  529</span>    }</div>
<div class="line"><a id="l00530" name="l00530"></a><span class="lineno">  530</span>    <span class="keywordflow">else</span> <span class="comment">// if constexpr(!S_TRANSMIT_NATIVE_HANDLES)</span></div>
<div class="line"><a id="l00531" name="l00531"></a><span class="lineno">  531</span>    {</div>
<div class="line"><a id="l00532" name="l00532"></a><span class="lineno">  532</span>      assert(<span class="keyword">false</span> &amp;&amp; <span class="stringliteral">&quot;This code should never be reached.&quot;</span>);</div>
<div class="line"><a id="l00533" name="l00533"></a><span class="lineno">  533</span>    }</div>
<div class="line"><a id="l00534" name="l00534"></a><span class="lineno">  534</span>  } <span class="comment">// if (m_user_request-&gt;m_target_hndl_ptr)</span></div>
<div class="line"><a id="l00535" name="l00535"></a><span class="lineno">  535</span>  <span class="keywordflow">else</span> <span class="comment">// Same deal/keeping comments light.</span></div>
<div class="line"><a id="l00536" name="l00536"></a><span class="lineno">  536</span>  {</div>
<div class="line"><a id="l00537" name="l00537"></a><span class="lineno">  537</span><span class="preprocessor">#ifndef NDEBUG</span></div>
<div class="line"><a id="l00538" name="l00538"></a><span class="lineno">  538</span>    ok =</div>
<div class="line"><a id="l00539" name="l00539"></a><span class="lineno">  539</span><span class="preprocessor">#endif</span></div>
<div class="line"><a id="l00540" name="l00540"></a><span class="lineno">  540</span>    m_sync_io.async_receive_blob(m_user_request-&gt;m_target_meta_blob, &amp;sync_err_code, &amp;sync_sz,</div>
<div class="line"><a id="l00541" name="l00541"></a><span class="lineno">  541</span>                                 [<span class="keyword">this</span>](<span class="keyword">const</span> <a class="code hl_typedef" href="namespaceipc.html#aa3192e586cc45d3e7c22463bf2760f89">Error_code</a>&amp; err_code, <span class="keywordtype">size_t</span> sz)</div>
<div class="line"><a id="l00542" name="l00542"></a><span class="lineno">  542</span>      { on_sync_io_rcv_done(err_code, sz); });</div>
<div class="line"><a id="l00543" name="l00543"></a><span class="lineno">  543</span>  } <span class="comment">// else if (!m_user_request-&gt;m_target_hndl_ptr)</span></div>
<div class="line"><a id="l00544" name="l00544"></a><span class="lineno">  544</span> </div>
<div class="line"><a id="l00545" name="l00545"></a><span class="lineno">  545</span>  assert(ok &amp;&amp; <span class="stringliteral">&quot;We are by definition in PEER state, and ctor starts receive-ops, and we never start a &quot;</span></div>
<div class="line"><a id="l00546" name="l00546"></a><span class="lineno">  546</span>               <span class="stringliteral">&quot;sync_io async-receive before ensuring previous one has executed; so that should never &quot;</span></div>
<div class="line"><a id="l00547" name="l00547"></a><span class="lineno">  547</span>               <span class="stringliteral">&quot;return false.  Bug somewhere?&quot;</span>);</div>
<div class="line"><a id="l00548" name="l00548"></a><span class="lineno">  548</span> </div>
<div class="line"><a id="l00549" name="l00549"></a><span class="lineno">  549</span>  <span class="keywordflow">if</span> (sync_err_code == <a class="code hl_enumvalue" href="namespaceipc_1_1transport_1_1error.html#adfef15ef4e76cc55d652fbd9c2797297aa667487757f9d6300f6888bac40bcc24">error::Code::S_SYNC_IO_WOULD_BLOCK</a>)</div>
<div class="line"><a id="l00550" name="l00550"></a><span class="lineno">  550</span>  {</div>
<div class="line"><a id="l00551" name="l00551"></a><span class="lineno">  551</span>    <span class="comment">// Async-wait started by m_sync_io.  It logged plenty.  We live to fight another day.</span></div>
<div class="line"><a id="l00552" name="l00552"></a><span class="lineno">  552</span>    <span class="keywordflow">return</span>;</div>
<div class="line"><a id="l00553" name="l00553"></a><span class="lineno">  553</span>  }</div>
<div class="line"><a id="l00554" name="l00554"></a><span class="lineno">  554</span>  <span class="comment">// else:</span></div>
<div class="line"><a id="l00555" name="l00555"></a><span class="lineno">  555</span> </div>
<div class="line"><a id="l00556" name="l00556"></a><span class="lineno">  556</span>  <span class="comment">/* Process the message and nullify m_user_request.  (It would also promote any m_pending_user_requests_q head</span></div>
<div class="line"><a id="l00557" name="l00557"></a><span class="lineno">  557</span><span class="comment">   * to m_user_request; but in our case that is not possible.  We are still in the user async-receive API!) */</span></div>
<div class="line"><a id="l00558" name="l00558"></a><span class="lineno">  558</span>  process_msg_or_error(sync_err_code, sync_sz);</div>
<div class="line"><a id="l00559" name="l00559"></a><span class="lineno">  559</span> </div>
<div class="line"><a id="l00560" name="l00560"></a><span class="lineno">  560</span>  FLOW_LOG_TRACE(<span class="stringliteral">&quot;Message was immediately available; synchronously returned to user; handler posted onto &quot;</span></div>
<div class="line"><a id="l00561" name="l00561"></a><span class="lineno">  561</span>                 <span class="stringliteral">&quot;async worker thread.  Done until next request.&quot;</span>);</div>
<div class="line"><a id="l00562" name="l00562"></a><span class="lineno">  562</span>} <span class="comment">// Async_adapter_receiver::async_receive_native_handle_impl()</span></div>
<div class="line"><a id="l00563" name="l00563"></a><span class="lineno">  563</span> </div>
<div class="line"><a id="l00564" name="l00564"></a><span class="lineno">  564</span><span class="keyword">template</span>&lt;<span class="keyword">typename</span> Core_t&gt;</div>
<div class="line"><a id="l00565" name="l00565"></a><span class="lineno"><a class="line" href="classipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver.html#afa5b0ab6ad54e0d3c93550226bfe2b33">  565</a></span><span class="keywordtype">void</span> <a class="code hl_function" href="classipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver.html#afa5b0ab6ad54e0d3c93550226bfe2b33">Async_adapter_receiver&lt;Core_t&gt;::process_msg_or_error</a>(<span class="keyword">const</span> <a class="code hl_typedef" href="namespaceipc.html#aa3192e586cc45d3e7c22463bf2760f89">Error_code</a>&amp; err_code, <span class="keywordtype">size_t</span> sz)</div>
<div class="line"><a id="l00566" name="l00566"></a><span class="lineno">  566</span>{</div>
<div class="line"><a id="l00567" name="l00567"></a><span class="lineno">  567</span>  <span class="keyword">using </span>flow::util::Lock_guard;</div>
<div class="line"><a id="l00568" name="l00568"></a><span class="lineno">  568</span>  <span class="keyword">using </span>std::queue;</div>
<div class="line"><a id="l00569" name="l00569"></a><span class="lineno">  569</span> </div>
<div class="line"><a id="l00570" name="l00570"></a><span class="lineno">  570</span>  <span class="comment">// We are in thread U or W.  m_mutex is locked.</span></div>
<div class="line"><a id="l00571" name="l00571"></a><span class="lineno">  571</span> </div>
<div class="line"><a id="l00572" name="l00572"></a><span class="lineno">  572</span>  assert(err_code != boost::asio::error::operation_aborted);</div>
<div class="line"><a id="l00573" name="l00573"></a><span class="lineno">  573</span>  assert((err_code != <a class="code hl_enumvalue" href="namespaceipc_1_1transport_1_1error.html#adfef15ef4e76cc55d652fbd9c2797297aa667487757f9d6300f6888bac40bcc24">error::Code::S_SYNC_IO_WOULD_BLOCK</a>) &amp;&amp; <span class="stringliteral">&quot;By our contract.&quot;</span>);</div>
<div class="line"><a id="l00574" name="l00574"></a><span class="lineno">  574</span> </div>
<div class="line"><a id="l00575" name="l00575"></a><span class="lineno">  575</span>  FLOW_LOG_TRACE(m_log_pfx &lt;&lt; <span class="stringliteral">&quot;: Earlier async-wait =&gt; event active =&gt; rcv-mutex lock =&gt; &quot;</span></div>
<div class="line"><a id="l00576" name="l00576"></a><span class="lineno">  576</span>                 <span class="stringliteral">&quot;on-active-event-func =&gt; sync_io module =&gt; on-rcv-done handler =&gt; here.  &quot;</span></div>
<div class="line"><a id="l00577" name="l00577"></a><span class="lineno">  577</span>                 <span class="stringliteral">&quot;Or else: rcv-mutex lock =&gt; sync_io module =&gt; no async-wait needed =&gt; here.&quot;</span>);</div>
<div class="line"><a id="l00578" name="l00578"></a><span class="lineno">  578</span> </div>
<div class="line"><a id="l00579" name="l00579"></a><span class="lineno">  579</span>  <span class="comment">/* As noted in our doc header, we have roughly two items on the agenda.</span></div>
<div class="line"><a id="l00580" name="l00580"></a><span class="lineno">  580</span><span class="comment">   *</span></div>
<div class="line"><a id="l00581" name="l00581"></a><span class="lineno">  581</span><span class="comment">   * 1, we need to invoke m_user_request-&gt;m_on_done_func, passing it the results (which are our args).</span></div>
<div class="line"><a id="l00582" name="l00582"></a><span class="lineno">  582</span><span class="comment">   *</span></div>
<div class="line"><a id="l00583" name="l00583"></a><span class="lineno">  583</span><span class="comment">   * 2, we need to update our m_* structures, such as popping stuff off m_pending_user_requests_q</span></div>
<div class="line"><a id="l00584" name="l00584"></a><span class="lineno">  584</span><span class="comment">   * and starting the next m_sync_io.async_receive_*() if any -- and so on.</span></div>
<div class="line"><a id="l00585" name="l00585"></a><span class="lineno">  585</span><span class="comment">   *</span></div>
<div class="line"><a id="l00586" name="l00586"></a><span class="lineno">  586</span><span class="comment">   * Oh and 2b: if err_code is truthy, we need to invoke all the pending handlers (if any) and nullify/empty</span></div>
<div class="line"><a id="l00587" name="l00587"></a><span class="lineno">  587</span><span class="comment">   * all of that.</span></div>
<div class="line"><a id="l00588" name="l00588"></a><span class="lineno">  588</span><span class="comment">   *</span></div>
<div class="line"><a id="l00589" name="l00589"></a><span class="lineno">  589</span><span class="comment">   * The question is what thread to do that stuff in.  There are a couple of approaches, at least, but the following</span></div>
<div class="line"><a id="l00590" name="l00590"></a><span class="lineno">  590</span><span class="comment">   * seems the least latency-ridden:</span></div>
<div class="line"><a id="l00591" name="l00591"></a><span class="lineno">  591</span><span class="comment">   *   - For 1 and 2b, we must post() the handler(s) onto thread W.</span></div>
<div class="line"><a id="l00592" name="l00592"></a><span class="lineno">  592</span><span class="comment">   *     - If we are in thread U: It is plainly required, as we promised to invoke completion handlers</span></div>
<div class="line"><a id="l00593" name="l00593"></a><span class="lineno">  593</span><span class="comment">   *       from unspecified thread that isn&#39;t U.</span></div>
<div class="line"><a id="l00594" name="l00594"></a><span class="lineno">  594</span><span class="comment">   *     - If we are in thread W: To avoid recursive mayhem if they choose to call some other API</span></div>
<div class="line"><a id="l00595" name="l00595"></a><span class="lineno">  595</span><span class="comment">   *       inside an on_done_func(), we queue it onto thread W by itself.  (But if it&#39;s 2b in addition to 1,</span></div>
<div class="line"><a id="l00596" name="l00596"></a><span class="lineno">  596</span><span class="comment">   *       then we can bundle them all together into one thread-W task; no need for the churn of post()ing</span></div>
<div class="line"><a id="l00597" name="l00597"></a><span class="lineno">  597</span><span class="comment">   *       each one individually.)</span></div>
<div class="line"><a id="l00598" name="l00598"></a><span class="lineno">  598</span><span class="comment">   *   - However for 2, there&#39;s no need to post() anything.  The mutex is already locked, so even if we&#39;re in thread</span></div>
<div class="line"><a id="l00599" name="l00599"></a><span class="lineno">  599</span><span class="comment">   *     U (m_sync_io.async_receive_*() succeeded synchronously, and this-&gt;async_receive_native_handle_impl()</span></div>
<div class="line"><a id="l00600" name="l00600"></a><span class="lineno">  600</span><span class="comment">   *     therefore invoked us synchronously, from thread U) we are within</span></div>
<div class="line"><a id="l00601" name="l00601"></a><span class="lineno">  601</span><span class="comment">   *     our rights to just finish the job here synchronously as well.  In fact, that&#39;s great!  It means</span></div>
<div class="line"><a id="l00602" name="l00602"></a><span class="lineno">  602</span><span class="comment">   *     data were waiting to be read right away, and we did everything we could synchronously in the</span></div>
<div class="line"><a id="l00603" name="l00603"></a><span class="lineno">  603</span><span class="comment">   *     original async_receive_*() call, post()ing onto thread W only 1 above -- the completion handler invoking (which</span></div>
<div class="line"><a id="l00604" name="l00604"></a><span class="lineno">  604</span><span class="comment">   *     we must do by contract).  Yay!  By the way, if that&#39;s the case (we are in thread U), then 2b doesn&#39;t apply;</span></div>
<div class="line"><a id="l00605" name="l00605"></a><span class="lineno">  605</span><span class="comment">   *     only 1 does.  (The situation where there are items in m_pending_user_requests_q means we wouldn&#39;t have</span></div>
<div class="line"><a id="l00606" name="l00606"></a><span class="lineno">  606</span><span class="comment">   *     started an actual m_sync_io.async_receive_*() in the first place, as one was already in progress.  So</span></div>
<div class="line"><a id="l00607" name="l00607"></a><span class="lineno">  607</span><span class="comment">   *     it couldn&#39;t have magically completed synchronously -- not having begun and all.) */</span></div>
<div class="line"><a id="l00608" name="l00608"></a><span class="lineno">  608</span> </div>
<div class="line"><a id="l00609" name="l00609"></a><span class="lineno">  609</span>  <span class="comment">// Okay, so first deal with m_*, here and now as discussed.  In so doing prepare the stuff to call in thread W.</span></div>
<div class="line"><a id="l00610" name="l00610"></a><span class="lineno">  610</span> </div>
<div class="line"><a id="l00611" name="l00611"></a><span class="lineno">  611</span>  assert(m_user_request);</div>
<div class="line"><a id="l00612" name="l00612"></a><span class="lineno">  612</span>  <span class="keyword">typename</span> <a class="code hl_typedef" href="structipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver_1_1User__request.html#ad716a5458992596636d5e3e4f9d83e9b">User_request::Ptr</a> ex_user_request(std::move(m_user_request));</div>
<div class="line"><a id="l00613" name="l00613"></a><span class="lineno">  613</span>  assert(!m_user_request);</div>
<div class="line"><a id="l00614" name="l00614"></a><span class="lineno">  614</span> </div>
<div class="line"><a id="l00615" name="l00615"></a><span class="lineno">  615</span>  queue&lt;typename User_request::Ptr&gt; ex_pending_user_requests_q_or_none;</div>
<div class="line"><a id="l00616" name="l00616"></a><span class="lineno">  616</span>  <span class="keywordflow">if</span> (err_code)</div>
<div class="line"><a id="l00617" name="l00617"></a><span class="lineno">  617</span>  {</div>
<div class="line"><a id="l00618" name="l00618"></a><span class="lineno">  618</span>    FLOW_LOG_TRACE(<span class="stringliteral">&quot;Error emitted by sync-IO =&gt; all [&quot;</span> &lt;&lt; m_pending_user_requests_q.size() &lt;&lt; <span class="stringliteral">&quot;] pending &quot;</span></div>
<div class="line"><a id="l00619" name="l00619"></a><span class="lineno">  619</span>                   <span class="stringliteral">&quot;handlers (may well be none) will be invoked with error in addition to the head handler.&quot;</span>);</div>
<div class="line"><a id="l00620" name="l00620"></a><span class="lineno">  620</span> </div>
<div class="line"><a id="l00621" name="l00621"></a><span class="lineno">  621</span>    ex_pending_user_requests_q_or_none = std::move(m_pending_user_requests_q);</div>
<div class="line"><a id="l00622" name="l00622"></a><span class="lineno">  622</span>    assert(m_pending_user_requests_q.empty());</div>
<div class="line"><a id="l00623" name="l00623"></a><span class="lineno">  623</span>  }</div>
<div class="line"><a id="l00624" name="l00624"></a><span class="lineno">  624</span>  <span class="keywordflow">else</span> <span class="keywordflow">if</span> (!m_pending_user_requests_q.empty()) <span class="comment">// &amp;&amp; (!err_code)</span></div>
<div class="line"><a id="l00625" name="l00625"></a><span class="lineno">  625</span>  {</div>
<div class="line"><a id="l00626" name="l00626"></a><span class="lineno">  626</span>    FLOW_LOG_TRACE(<span class="stringliteral">&quot;Success emitted by sync-IO =&gt; lead handler will be invoked; next pending request will &quot;</span></div>
<div class="line"><a id="l00627" name="l00627"></a><span class="lineno">  627</span>                   <span class="stringliteral">&quot;be serviced by sync-IO; pending request count has become (after popping from queue into lead &quot;</span></div>
<div class="line"><a id="l00628" name="l00628"></a><span class="lineno">  628</span>                   <span class="stringliteral">&quot;slot): [&quot;</span> &lt;&lt; (m_pending_user_requests_q.size() - 1) &lt;&lt; <span class="stringliteral">&quot;].\n&quot;</span>);</div>
<div class="line"><a id="l00629" name="l00629"></a><span class="lineno">  629</span> </div>
<div class="line"><a id="l00630" name="l00630"></a><span class="lineno">  630</span>    m_user_request = std::move(m_pending_user_requests_q.front());</div>
<div class="line"><a id="l00631" name="l00631"></a><span class="lineno">  631</span>    <span class="comment">// m_pending_user_requests_q.front() is now null; we&#39;re gonna pop that null ptr presently.</span></div>
<div class="line"><a id="l00632" name="l00632"></a><span class="lineno">  632</span>    m_pending_user_requests_q.pop();</div>
<div class="line"><a id="l00633" name="l00633"></a><span class="lineno">  633</span>  }</div>
<div class="line"><a id="l00634" name="l00634"></a><span class="lineno">  634</span>  <span class="keywordflow">else</span> <span class="comment">// if (_q.empty() &amp;&amp; (!err_code))</span></div>
<div class="line"><a id="l00635" name="l00635"></a><span class="lineno">  635</span>  {</div>
<div class="line"><a id="l00636" name="l00636"></a><span class="lineno">  636</span>    FLOW_LOG_TRACE(<span class="stringliteral">&quot;Success emitted by sync-IO =&gt; lead handler will be invoked; no pending requests queued up.\n&quot;</span>);</div>
<div class="line"><a id="l00637" name="l00637"></a><span class="lineno">  637</span>  }</div>
<div class="line"><a id="l00638" name="l00638"></a><span class="lineno">  638</span> </div>
<div class="line"><a id="l00639" name="l00639"></a><span class="lineno">  639</span>  <span class="comment">// Second: Post the completion handlers as discussed.</span></div>
<div class="line"><a id="l00640" name="l00640"></a><span class="lineno">  640</span>  m_worker.post([<span class="keyword">this</span>, err_code, sz,</div>
<div class="line"><a id="l00641" name="l00641"></a><span class="lineno">  641</span>                 <span class="comment">/* Have to upgrade to shared_ptr&lt;&gt;s due to capturing requiring copyability (even though copying is not</span></div>
<div class="line"><a id="l00642" name="l00642"></a><span class="lineno">  642</span><span class="comment">                  * actually invoked by us).  unique_ptr and queue&lt;unique_ptr&gt; = not copyable. */</span></div>
<div class="line"><a id="l00643" name="l00643"></a><span class="lineno">  643</span>                 ex_user_request = boost::shared_ptr&lt;User_request&gt;(std::move(ex_user_request)),</div>
<div class="line"><a id="l00644" name="l00644"></a><span class="lineno">  644</span>                 ex_pending_user_requests_q_or_none</div>
<div class="line"><a id="l00645" name="l00645"></a><span class="lineno">  645</span>                   = boost::make_shared&lt;<span class="keyword">decltype</span>(ex_pending_user_requests_q_or_none)&gt;</div>
<div class="line"><a id="l00646" name="l00646"></a><span class="lineno">  646</span>                       (std::move(ex_pending_user_requests_q_or_none))]()</div>
<div class="line"><a id="l00647" name="l00647"></a><span class="lineno">  647</span>  {</div>
<div class="line"><a id="l00648" name="l00648"></a><span class="lineno">  648</span>    <span class="comment">// We are in thread W.  Nothing is locked.</span></div>
<div class="line"><a id="l00649" name="l00649"></a><span class="lineno">  649</span> </div>
<div class="line"><a id="l00650" name="l00650"></a><span class="lineno">  650</span>    assert(ex_user_request);</div>
<div class="line"><a id="l00651" name="l00651"></a><span class="lineno">  651</span>    FLOW_LOG_TRACE(m_log_pfx &lt;&lt; <span class="stringliteral">&quot;: Invoking head handler.&quot;</span>);</div>
<div class="line"><a id="l00652" name="l00652"></a><span class="lineno">  652</span>    (ex_user_request-&gt;m_on_done_func)(err_code, sz);</div>
<div class="line"><a id="l00653" name="l00653"></a><span class="lineno">  653</span>    FLOW_LOG_TRACE(<span class="stringliteral">&quot;Handler completed.&quot;</span>);</div>
<div class="line"><a id="l00654" name="l00654"></a><span class="lineno">  654</span>    <span class="keywordflow">if</span> (!ex_pending_user_requests_q_or_none-&gt;empty())</div>
<div class="line"><a id="l00655" name="l00655"></a><span class="lineno">  655</span>    {</div>
<div class="line"><a id="l00656" name="l00656"></a><span class="lineno">  656</span>      assert(err_code);</div>
<div class="line"><a id="l00657" name="l00657"></a><span class="lineno">  657</span>      assert(sz == 0);</div>
<div class="line"><a id="l00658" name="l00658"></a><span class="lineno">  658</span> </div>
<div class="line"><a id="l00659" name="l00659"></a><span class="lineno">  659</span>      FLOW_LOG_TRACE(m_log_pfx &lt;&lt; <span class="stringliteral">&quot;: Invoking [&quot;</span> &lt;&lt; ex_pending_user_requests_q_or_none-&gt;size() &lt;&lt; <span class="stringliteral">&quot;] &quot;</span></div>
<div class="line"><a id="l00660" name="l00660"></a><span class="lineno">  660</span>                     <span class="stringliteral">&quot;pending handlers in one shot (due to error).&quot;</span>);</div>
<div class="line"><a id="l00661" name="l00661"></a><span class="lineno">  661</span>      <span class="keywordflow">while</span> (!ex_pending_user_requests_q_or_none-&gt;empty())</div>
<div class="line"><a id="l00662" name="l00662"></a><span class="lineno">  662</span>      {</div>
<div class="line"><a id="l00663" name="l00663"></a><span class="lineno">  663</span>        ex_pending_user_requests_q_or_none-&gt;front()-&gt;m_on_done_func(err_code, 0);</div>
<div class="line"><a id="l00664" name="l00664"></a><span class="lineno">  664</span>        ex_pending_user_requests_q_or_none-&gt;pop();</div>
<div class="line"><a id="l00665" name="l00665"></a><span class="lineno">  665</span>        FLOW_LOG_TRACE(<span class="stringliteral">&quot;In-queue handler finished.&quot;</span>);</div>
<div class="line"><a id="l00666" name="l00666"></a><span class="lineno">  666</span>      }</div>
<div class="line"><a id="l00667" name="l00667"></a><span class="lineno">  667</span>      <span class="comment">// @todo For modest perf, iterate through it; then .clear().  Maybe use an underlying deque&lt;&gt; or list&lt;&gt; directly.</span></div>
<div class="line"><a id="l00668" name="l00668"></a><span class="lineno">  668</span>    } <span class="comment">// if (!ex_pending_user_requests_q_or_none-&gt;empty())</span></div>
<div class="line"><a id="l00669" name="l00669"></a><span class="lineno">  669</span>  }); <span class="comment">// m_worker.post()</span></div>
<div class="line"><a id="l00670" name="l00670"></a><span class="lineno">  670</span> </div>
<div class="line"><a id="l00671" name="l00671"></a><span class="lineno">  671</span>  assert(!ex_user_request); <span class="comment">// Hosed by move().</span></div>
<div class="line"><a id="l00672" name="l00672"></a><span class="lineno">  672</span>  assert(ex_pending_user_requests_q_or_none.empty());</div>
<div class="line"><a id="l00673" name="l00673"></a><span class="lineno">  673</span>} <span class="comment">// Async_adapter_receiver::process_msg_or_error()</span></div>
<div class="line"><a id="l00674" name="l00674"></a><span class="lineno">  674</span> </div>
<div class="line"><a id="l00675" name="l00675"></a><span class="lineno">  675</span><span class="keyword">template</span>&lt;<span class="keyword">typename</span> Core_t&gt;</div>
<div class="line"><a id="l00676" name="l00676"></a><span class="lineno"><a class="line" href="classipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver.html#a98d7b3caa0f0b00c75671278e7971017">  676</a></span><span class="keywordtype">void</span> <a class="code hl_function" href="classipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver.html#a98d7b3caa0f0b00c75671278e7971017">Async_adapter_receiver&lt;Core_t&gt;::on_sync_io_rcv_done</a>(<span class="keyword">const</span> <a class="code hl_typedef" href="namespaceipc.html#aa3192e586cc45d3e7c22463bf2760f89">Error_code</a>&amp; err_code, <span class="keywordtype">size_t</span> sz)</div>
<div class="line"><a id="l00677" name="l00677"></a><span class="lineno">  677</span>{</div>
<div class="line"><a id="l00678" name="l00678"></a><span class="lineno">  678</span>  <span class="keyword">using </span>flow::util::Lock_guard;</div>
<div class="line"><a id="l00679" name="l00679"></a><span class="lineno">  679</span>  <span class="keyword">using </span>std::queue;</div>
<div class="line"><a id="l00680" name="l00680"></a><span class="lineno">  680</span> </div>
<div class="line"><a id="l00681" name="l00681"></a><span class="lineno">  681</span>  <span class="comment">// We are in thread W.  m_mutex is locked.</span></div>
<div class="line"><a id="l00682" name="l00682"></a><span class="lineno">  682</span> </div>
<div class="line"><a id="l00683" name="l00683"></a><span class="lineno">  683</span>  assert(err_code != boost::asio::error::operation_aborted);</div>
<div class="line"><a id="l00684" name="l00684"></a><span class="lineno">  684</span>  assert(err_code != <a class="code hl_enumvalue" href="namespaceipc_1_1transport_1_1error.html#adfef15ef4e76cc55d652fbd9c2797297aa667487757f9d6300f6888bac40bcc24">error::Code::S_SYNC_IO_WOULD_BLOCK</a>);</div>
<div class="line"><a id="l00685" name="l00685"></a><span class="lineno">  685</span> </div>
<div class="line"><a id="l00686" name="l00686"></a><span class="lineno">  686</span>  FLOW_LOG_TRACE(m_log_pfx &lt;&lt; <span class="stringliteral">&quot;: Earlier async-wait =&gt; event active =&gt; rcv-mutex lock =&gt; &quot;</span></div>
<div class="line"><a id="l00687" name="l00687"></a><span class="lineno">  687</span>                 <span class="stringliteral">&quot;on-active-event-func =&gt; sync_io module =&gt; here (on-rcv-done handler).&quot;</span>);</div>
<div class="line"><a id="l00688" name="l00688"></a><span class="lineno">  688</span> </div>
<div class="line"><a id="l00689" name="l00689"></a><span class="lineno">  689</span>  <span class="comment">/* This is not *too* different from thread-U (or thread-W if invoked from our own handler)</span></div>
<div class="line"><a id="l00690" name="l00690"></a><span class="lineno">  690</span><span class="comment">   * async_receive_native_handle_impl()... except that in our case more requests may have been queued (as summarized</span></div>
<div class="line"><a id="l00691" name="l00691"></a><span class="lineno">  691</span><span class="comment">   * in top comment in that method) during our async-wait that just finished.  And, of course, we need</span></div>
<div class="line"><a id="l00692" name="l00692"></a><span class="lineno">  692</span><span class="comment">   * to process the ready message first-thing.  But let&#39;s say that&#39;s taken care of.  After that: we can&#39;t just</span></div>
<div class="line"><a id="l00693" name="l00693"></a><span class="lineno">  693</span><span class="comment">   * stop; there may be queued request.  We shall process them as synchronously as possible in a do-while()</span></div>
<div class="line"><a id="l00694" name="l00694"></a><span class="lineno">  694</span><span class="comment">   * loop.  That&#39;s the executive summary. */</span></div>
<div class="line"><a id="l00695" name="l00695"></a><span class="lineno">  695</span> </div>
<div class="line"><a id="l00696" name="l00696"></a><span class="lineno">  696</span>  <span class="comment">/* So handle the message or error -- W-post any relevant handlers; update m_user_request and</span></div>
<div class="line"><a id="l00697" name="l00697"></a><span class="lineno">  697</span><span class="comment">   * m_pending_user_requests_q. */</span></div>
<div class="line"><a id="l00698" name="l00698"></a><span class="lineno">  698</span>  process_msg_or_error(err_code, sz);</div>
<div class="line"><a id="l00699" name="l00699"></a><span class="lineno">  699</span> </div>
<div class="line"><a id="l00700" name="l00700"></a><span class="lineno">  700</span>  <a class="code hl_typedef" href="namespaceipc.html#aa3192e586cc45d3e7c22463bf2760f89">Error_code</a> sync_err_code;</div>
<div class="line"><a id="l00701" name="l00701"></a><span class="lineno">  701</span>  <span class="keyword">auto</span>&amp; sync_sz = sz; <span class="comment">// (Might as well reuse the arg.)</span></div>
<div class="line"><a id="l00702" name="l00702"></a><span class="lineno">  702</span> </div>
<div class="line"><a id="l00703" name="l00703"></a><span class="lineno">  703</span>  <span class="comment">/* First iteration: sync_err_code is definitely not would-block; m_user_request may be null.</span></div>
<div class="line"><a id="l00704" name="l00704"></a><span class="lineno">  704</span><span class="comment">   * Subsequent iterations: sync_err_code may be would-block. */</span></div>
<div class="line"><a id="l00705" name="l00705"></a><span class="lineno">  705</span>  <span class="keywordflow">while</span> (m_user_request &amp;&amp; (sync_err_code != <a class="code hl_enumvalue" href="namespaceipc_1_1transport_1_1error.html#adfef15ef4e76cc55d652fbd9c2797297aa667487757f9d6300f6888bac40bcc24">error::Code::S_SYNC_IO_WOULD_BLOCK</a>))</div>
<div class="line"><a id="l00706" name="l00706"></a><span class="lineno">  706</span>  {</div>
<div class="line"><a id="l00707" name="l00707"></a><span class="lineno">  707</span>    <span class="comment">// @todo Code reuse with async_receive_native_handle_impl()?  For now keeping comments light.</span></div>
<div class="line"><a id="l00708" name="l00708"></a><span class="lineno">  708</span><span class="preprocessor">#ifndef NDEBUG</span></div>
<div class="line"><a id="l00709" name="l00709"></a><span class="lineno">  709</span>    <span class="keywordtype">bool</span> ok;</div>
<div class="line"><a id="l00710" name="l00710"></a><span class="lineno">  710</span><span class="preprocessor">#endif</span></div>
<div class="line"><a id="l00711" name="l00711"></a><span class="lineno">  711</span>    <span class="keywordflow">if</span> (m_user_request-&gt;m_target_hndl_ptr)</div>
<div class="line"><a id="l00712" name="l00712"></a><span class="lineno">  712</span>    {</div>
<div class="line"><a id="l00713" name="l00713"></a><span class="lineno">  713</span>      <span class="keywordflow">if</span> <span class="keyword">constexpr</span>(Core::S_TRANSMIT_NATIVE_HANDLES)</div>
<div class="line"><a id="l00714" name="l00714"></a><span class="lineno">  714</span>      {</div>
<div class="line"><a id="l00715" name="l00715"></a><span class="lineno">  715</span><span class="preprocessor">#ifndef NDEBUG</span></div>
<div class="line"><a id="l00716" name="l00716"></a><span class="lineno">  716</span>        ok =</div>
<div class="line"><a id="l00717" name="l00717"></a><span class="lineno">  717</span><span class="preprocessor">#endif</span></div>
<div class="line"><a id="l00718" name="l00718"></a><span class="lineno">  718</span>        m_sync_io.async_receive_native_handle(m_user_request-&gt;m_target_hndl_ptr, m_user_request-&gt;m_target_meta_blob,</div>
<div class="line"><a id="l00719" name="l00719"></a><span class="lineno">  719</span>                                              &amp;sync_err_code, &amp;sync_sz,</div>
<div class="line"><a id="l00720" name="l00720"></a><span class="lineno">  720</span>                                              [<span class="keyword">this</span>](<span class="keyword">const</span> <a class="code hl_typedef" href="namespaceipc.html#aa3192e586cc45d3e7c22463bf2760f89">Error_code</a>&amp; err_code, <span class="keywordtype">size_t</span> sz)</div>
<div class="line"><a id="l00721" name="l00721"></a><span class="lineno">  721</span>        {</div>
<div class="line"><a id="l00722" name="l00722"></a><span class="lineno">  722</span>          on_sync_io_rcv_done(err_code, sz); <span class="comment">// Back to us (async path).</span></div>
<div class="line"><a id="l00723" name="l00723"></a><span class="lineno">  723</span>        });</div>
<div class="line"><a id="l00724" name="l00724"></a><span class="lineno">  724</span>      }</div>
<div class="line"><a id="l00725" name="l00725"></a><span class="lineno">  725</span>      <span class="keywordflow">else</span> <span class="comment">// if constexpr(!S_TRANSMIT_NATIVE_HANDLES)</span></div>
<div class="line"><a id="l00726" name="l00726"></a><span class="lineno">  726</span>      {</div>
<div class="line"><a id="l00727" name="l00727"></a><span class="lineno">  727</span>        assert(<span class="keyword">false</span> &amp;&amp; <span class="stringliteral">&quot;This code should never be reached.&quot;</span>);</div>
<div class="line"><a id="l00728" name="l00728"></a><span class="lineno">  728</span>      }</div>
<div class="line"><a id="l00729" name="l00729"></a><span class="lineno">  729</span>    } <span class="comment">// if (m_user_request-&gt;m_target_hndl_ptr)</span></div>
<div class="line"><a id="l00730" name="l00730"></a><span class="lineno">  730</span>    <span class="keywordflow">else</span></div>
<div class="line"><a id="l00731" name="l00731"></a><span class="lineno">  731</span>    {</div>
<div class="line"><a id="l00732" name="l00732"></a><span class="lineno">  732</span><span class="preprocessor">#ifndef NDEBUG</span></div>
<div class="line"><a id="l00733" name="l00733"></a><span class="lineno">  733</span>      ok =</div>
<div class="line"><a id="l00734" name="l00734"></a><span class="lineno">  734</span><span class="preprocessor">#endif</span></div>
<div class="line"><a id="l00735" name="l00735"></a><span class="lineno">  735</span>      m_sync_io.async_receive_blob(m_user_request-&gt;m_target_meta_blob, &amp;sync_err_code, &amp;sync_sz,</div>
<div class="line"><a id="l00736" name="l00736"></a><span class="lineno">  736</span>                                   [<span class="keyword">this</span>](<span class="keyword">const</span> <a class="code hl_typedef" href="namespaceipc.html#aa3192e586cc45d3e7c22463bf2760f89">Error_code</a>&amp; err_code, <span class="keywordtype">size_t</span> sz)</div>
<div class="line"><a id="l00737" name="l00737"></a><span class="lineno">  737</span>        { on_sync_io_rcv_done(err_code, sz); });</div>
<div class="line"><a id="l00738" name="l00738"></a><span class="lineno">  738</span>    } <span class="comment">// else if (!m_user_request-&gt;m_target_hndl_ptr)</span></div>
<div class="line"><a id="l00739" name="l00739"></a><span class="lineno">  739</span>    assert(ok &amp;&amp; <span class="stringliteral">&quot;We are by definition in PEER state, and ctor starts receive-ops, and we never start a &quot;</span></div>
<div class="line"><a id="l00740" name="l00740"></a><span class="lineno">  740</span>                 <span class="stringliteral">&quot;sync_io async-receive before ensuring previous one has executed; so that should never &quot;</span></div>
<div class="line"><a id="l00741" name="l00741"></a><span class="lineno">  741</span>                 <span class="stringliteral">&quot;return false.  Bug somewhere?&quot;</span>);</div>
<div class="line"><a id="l00742" name="l00742"></a><span class="lineno">  742</span> </div>
<div class="line"><a id="l00743" name="l00743"></a><span class="lineno">  743</span>    <span class="keywordflow">if</span> (sync_err_code == <a class="code hl_enumvalue" href="namespaceipc_1_1transport_1_1error.html#adfef15ef4e76cc55d652fbd9c2797297aa667487757f9d6300f6888bac40bcc24">error::Code::S_SYNC_IO_WOULD_BLOCK</a>)</div>
<div class="line"><a id="l00744" name="l00744"></a><span class="lineno">  744</span>    {</div>
<div class="line"><a id="l00745" name="l00745"></a><span class="lineno">  745</span>      <span class="keywordflow">continue</span>; <span class="comment">// Loop will end.</span></div>
<div class="line"><a id="l00746" name="l00746"></a><span class="lineno">  746</span>    }</div>
<div class="line"><a id="l00747" name="l00747"></a><span class="lineno">  747</span>    <span class="comment">// else</span></div>
<div class="line"><a id="l00748" name="l00748"></a><span class="lineno">  748</span> </div>
<div class="line"><a id="l00749" name="l00749"></a><span class="lineno">  749</span>    <span class="comment">/* Remaining outcomes: sync_err_code truthy =&gt; process_msg_or_error() will do the right thing.</span></div>
<div class="line"><a id="l00750" name="l00750"></a><span class="lineno">  750</span><span class="comment">     *                     sync_err_code is falsy =&gt; ditto. */</span></div>
<div class="line"><a id="l00751" name="l00751"></a><span class="lineno">  751</span> </div>
<div class="line"><a id="l00752" name="l00752"></a><span class="lineno">  752</span>    process_msg_or_error(sync_err_code, sync_sz);</div>
<div class="line"><a id="l00753" name="l00753"></a><span class="lineno">  753</span> </div>
<div class="line"><a id="l00754" name="l00754"></a><span class="lineno">  754</span>    <span class="comment">/* Outcomes: Error =&gt; m_user_request is null, m_pending_user_requests_q is null.  No req to service.  Loop end.</span></div>
<div class="line"><a id="l00755" name="l00755"></a><span class="lineno">  755</span><span class="comment">     *           Success =&gt; m_user_request is null, m_pending_user_requests_q is null.  No req to service.  Loop end.</span></div>
<div class="line"><a id="l00756" name="l00756"></a><span class="lineno">  756</span><span class="comment">     *           Success =&gt; m_user_request is NOT null, m_pending_user_requests_q is ???.  Req needs service.</span></div>
<div class="line"><a id="l00757" name="l00757"></a><span class="lineno">  757</span><span class="comment">     * In no case is sync_err_code (at this point) would-block.  Hence: time to check loop condition. */</span></div>
<div class="line"><a id="l00758" name="l00758"></a><span class="lineno">  758</span>  } <span class="comment">// while (m_user_request &amp;&amp; (sync_err_code != error::Code::S_SYNC_IO_WOULD_BLOCK));</span></div>
<div class="line"><a id="l00759" name="l00759"></a><span class="lineno">  759</span>} <span class="comment">// Async_adapter_receiver::on_sync_io_rcv_done()</span></div>
<div class="line"><a id="l00760" name="l00760"></a><span class="lineno">  760</span> </div>
<div class="line"><a id="l00761" name="l00761"></a><span class="lineno">  761</span><span class="keyword">template</span>&lt;<span class="keyword">typename</span> Core_t&gt;</div>
<div class="line"><a id="l00762" name="l00762"></a><span class="lineno"><a class="line" href="classipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver.html#a2067b525e54efd90bdc584cf77f7ae4b">  762</a></span><span class="keywordtype">bool</span> <a class="code hl_function" href="classipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver.html#a2067b525e54efd90bdc584cf77f7ae4b">Async_adapter_receiver&lt;Core_t&gt;::idle_timer_run</a>(<a class="code hl_typedef" href="namespaceipc_1_1util.html#ac66141280c3b7295a86b65209f31cc58">util::Fine_duration</a> timeout)</div>
<div class="line"><a id="l00763" name="l00763"></a><span class="lineno">  763</span>{</div>
<div class="line"><a id="l00764" name="l00764"></a><span class="lineno">  764</span>  <span class="keyword">using </span>flow::util::Lock_guard;</div>
<div class="line"><a id="l00765" name="l00765"></a><span class="lineno">  765</span> </div>
<div class="line"><a id="l00766" name="l00766"></a><span class="lineno">  766</span>  <span class="comment">// Like Async_adapter_sender::send_native_handle() and others (keeping comments light).</span></div>
<div class="line"><a id="l00767" name="l00767"></a><span class="lineno">  767</span> </div>
<div class="line"><a id="l00768" name="l00768"></a><span class="lineno">  768</span>  Lock_guard&lt;<span class="keyword">decltype</span>(m_mutex)&gt; lock(m_mutex);</div>
<div class="line"><a id="l00769" name="l00769"></a><span class="lineno">  769</span>  <span class="keywordflow">return</span> m_sync_io.idle_timer_run(timeout);</div>
<div class="line"><a id="l00770" name="l00770"></a><span class="lineno">  770</span>}</div>
<div class="line"><a id="l00771" name="l00771"></a><span class="lineno">  771</span> </div>
<div class="line"><a id="l00772" name="l00772"></a><span class="lineno">  772</span>} <span class="comment">// namespace ipc::transport::sync_io</span></div>
<div class="ttc" id="aclassipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver_html"><div class="ttname"><a href="classipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver.html">ipc::transport::sync_io::Async_adapter_receiver</a></div><div class="ttdoc">Internal-use type that adapts a given PEER-state sync_io::Native_handle_receiver or sync_io::Blob_rec...</div><div class="ttdef"><b>Definition:</b> <a href="async__adapter__rcv_8hpp_source.html#l00084">async_adapter_rcv.hpp:87</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver_html_a0df3c0d0291cb4d3ea7fbd8214a12cb8"><div class="ttname"><a href="classipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver.html#a0df3c0d0291cb4d3ea7fbd8214a12cb8">ipc::transport::sync_io::Async_adapter_receiver::m_worker</a></div><div class="ttdeci">flow::async::Single_thread_task_loop &amp; m_worker</div><div class="ttdoc">Single-thread worker pool for all internal async work. Referred to as thread W in comments.</div><div class="ttdef"><b>Definition:</b> <a href="async__adapter__rcv_8hpp_source.html#l00285">async_adapter_rcv.hpp:285</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver_html_a113a43c175209f7e3293f75ab4bcd794"><div class="ttname"><a href="classipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver.html#a113a43c175209f7e3293f75ab4bcd794">ipc::transport::sync_io::Async_adapter_receiver::m_mutex</a></div><div class="ttdeci">flow::util::Mutex_non_recursive m_mutex</div><div class="ttdoc">Protects m_user_request, m_pending_user_requests_q, and receive-ops data of m_sync_io.</div><div class="ttdef"><b>Definition:</b> <a href="async__adapter__rcv_8hpp_source.html#l00282">async_adapter_rcv.hpp:282</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver_html_a13a636ca275a188bd3727e2d7c247f0e"><div class="ttname"><a href="classipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver.html#a13a636ca275a188bd3727e2d7c247f0e">ipc::transport::sync_io::Async_adapter_receiver::m_pending_user_requests_q</a></div><div class="ttdeci">std::queue&lt; typename User_request::Ptr &gt; m_pending_user_requests_q</div><div class="ttdoc">Queue storing deficit async-receive requests queued up due to m_user_request being not null while mor...</div><div class="ttdef"><b>Definition:</b> <a href="async__adapter__rcv_8hpp_source.html#l00279">async_adapter_rcv.hpp:279</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver_html_a2067b525e54efd90bdc584cf77f7ae4b"><div class="ttname"><a href="classipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver.html#a2067b525e54efd90bdc584cf77f7ae4b">ipc::transport::sync_io::Async_adapter_receiver::idle_timer_run</a></div><div class="ttdeci">bool idle_timer_run(util::Fine_duration timeout)</div><div class="ttdoc">See Native_handle_receiver counterpart.</div><div class="ttdef"><b>Definition:</b> <a href="async__adapter__rcv_8hpp_source.html#l00762">async_adapter_rcv.hpp:762</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver_html_a2f32f38020a0d21499b1c0b724ff332b"><div class="ttname"><a href="classipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver.html#a2f32f38020a0d21499b1c0b724ff332b">ipc::transport::sync_io::Async_adapter_receiver::Async_adapter_receiver</a></div><div class="ttdeci">Async_adapter_receiver(flow::log::Logger *logger_ptr, util::String_view log_pfx, flow::async::Single_thread_task_loop *worker, Core *sync_io)</div><div class="ttdoc">Constructs the adapter around sync_io::X object *sync_io.</div><div class="ttdef"><b>Definition:</b> <a href="async__adapter__rcv_8hpp_source.html#l00303">async_adapter_rcv.hpp:303</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver_html_a5dd1bf37b817a3ebbb968d34f0d240b1"><div class="ttname"><a href="classipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver.html#a5dd1bf37b817a3ebbb968d34f0d240b1">ipc::transport::sync_io::Async_adapter_receiver::m_log_pfx</a></div><div class="ttdeci">const std::string m_log_pfx</div><div class="ttdoc">See log_pfx arg of ctor.</div><div class="ttdef"><b>Definition:</b> <a href="async__adapter__rcv_8hpp_source.html#l00250">async_adapter_rcv.hpp:250</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver_html_a6cf425ab8e3258924e6d1db12da2fbf5"><div class="ttname"><a href="classipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver.html#a6cf425ab8e3258924e6d1db12da2fbf5">ipc::transport::sync_io::Async_adapter_receiver::async_receive_native_handle_impl</a></div><div class="ttdeci">void async_receive_native_handle_impl(Native_handle *target_hndl_or_null, const util::Blob_mutable &amp;target_meta_blob, flow::async::Task_asio_err_sz &amp;&amp;on_done_func)</div><div class="ttdoc">Body of async_receive_native_handle() and async_receive_blob(); with target_hndl null if and only if ...</div><div class="ttdef"><b>Definition:</b> <a href="async__adapter__rcv_8hpp_source.html#l00439">async_adapter_rcv.hpp:439</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver_html_a76d81cb59e1b91c7f379064dd285aa93"><div class="ttname"><a href="classipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver.html#a76d81cb59e1b91c7f379064dd285aa93">ipc::transport::sync_io::Async_adapter_receiver::m_user_request</a></div><div class="ttdeci">User_request::Ptr m_user_request</div><div class="ttdoc">The head slot containing the currently-being-serviced &quot;deficit&quot; async-receive request,...</div><div class="ttdef"><b>Definition:</b> <a href="async__adapter__rcv_8hpp_source.html#l00263">async_adapter_rcv.hpp:263</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver_html_a80428aeb0d3f9e836fe897fc1e42601a"><div class="ttname"><a href="classipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver.html#a80428aeb0d3f9e836fe897fc1e42601a">ipc::transport::sync_io::Async_adapter_receiver::~Async_adapter_receiver</a></div><div class="ttdeci">~Async_adapter_receiver()</div><div class="ttdoc">To be invoked after -&gt;stop()ping *worker (from ctor), as well as flushing any still-queued tasks in i...</div><div class="ttdef"><b>Definition:</b> <a href="async__adapter__rcv_8hpp_source.html#l00376">async_adapter_rcv.hpp:376</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver_html_a98d7b3caa0f0b00c75671278e7971017"><div class="ttname"><a href="classipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver.html#a98d7b3caa0f0b00c75671278e7971017">ipc::transport::sync_io::Async_adapter_receiver::on_sync_io_rcv_done</a></div><div class="ttdeci">void on_sync_io_rcv_done(const Error_code &amp;err_code, size_t sz)</div><div class="ttdoc">Invoked via active-event API, handles the async completion of m_sync_io.async_receive_*() operation.</div><div class="ttdef"><b>Definition:</b> <a href="async__adapter__rcv_8hpp_source.html#l00676">async_adapter_rcv.hpp:676</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver_html_abcbc91de36b298c68e5461997a9a0263"><div class="ttname"><a href="classipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver.html#abcbc91de36b298c68e5461997a9a0263">ipc::transport::sync_io::Async_adapter_receiver::async_receive_native_handle</a></div><div class="ttdeci">void async_receive_native_handle(Native_handle *target_hndl, const util::Blob_mutable &amp;target_meta_blob, flow::async::Task_asio_err_sz &amp;&amp;on_done_func)</div><div class="ttdoc">See Native_handle_sender counterpart.</div><div class="ttdef"><b>Definition:</b> <a href="async__adapter__rcv_8hpp_source.html#l00418">async_adapter_rcv.hpp:418</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver_html_ade3098cb69a47a374cf0354677e2fb0b"><div class="ttname"><a href="classipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver.html#ade3098cb69a47a374cf0354677e2fb0b">ipc::transport::sync_io::Async_adapter_receiver::async_receive_blob</a></div><div class="ttdeci">void async_receive_blob(const util::Blob_mutable &amp;target_blob, flow::async::Task_asio_err_sz &amp;&amp;on_done_func)</div><div class="ttdoc">See Blob_receiver counterpart.</div><div class="ttdef"><b>Definition:</b> <a href="async__adapter__rcv_8hpp_source.html#l00432">async_adapter_rcv.hpp:432</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver_html_aeb37be595e9cfce9e0185acee7eeac80"><div class="ttname"><a href="classipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver.html#aeb37be595e9cfce9e0185acee7eeac80">ipc::transport::sync_io::Async_adapter_receiver::Core</a></div><div class="ttdeci">Core_t Core</div><div class="ttdoc">The sync_io::X type being adapted into async-I/O-pattern X.</div><div class="ttdef"><b>Definition:</b> <a href="async__adapter__rcv_8hpp_source.html#l00092">async_adapter_rcv.hpp:92</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver_html_af07534b8b9beb4e47b1af513d82d7460"><div class="ttname"><a href="classipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver.html#af07534b8b9beb4e47b1af513d82d7460">ipc::transport::sync_io::Async_adapter_receiver::m_sync_io</a></div><div class="ttdeci">Core &amp; m_sync_io</div><div class="ttdoc">The core Core engine, implementing the sync_io pattern (see util::sync_io doc header).</div><div class="ttdef"><b>Definition:</b> <a href="async__adapter__rcv_8hpp_source.html#l00297">async_adapter_rcv.hpp:297</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver_html_afa5b0ab6ad54e0d3c93550226bfe2b33"><div class="ttname"><a href="classipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver.html#afa5b0ab6ad54e0d3c93550226bfe2b33">ipc::transport::sync_io::Async_adapter_receiver::process_msg_or_error</a></div><div class="ttdeci">void process_msg_or_error(const Error_code &amp;err_code, size_t sz)</div><div class="ttdoc">Invoked from thread U/W (async_receive_native_handle_impl()) or thread W (active-event API),...</div><div class="ttdef"><b>Definition:</b> <a href="async__adapter__rcv_8hpp_source.html#l00565">async_adapter_rcv.hpp:565</a></div></div>
<div class="ttc" id="aclassipc_1_1util_1_1sync__io_1_1Asio__waitable__native__handle_html"><div class="ttname"><a href="classipc_1_1util_1_1sync__io_1_1Asio__waitable__native__handle.html">ipc::util::sync_io::Asio_waitable_native_handle</a></div><div class="ttdoc">Useful if using the sync_io pattern within a user event loop built on boost.asio (optionally with flo...</div><div class="ttdef"><b>Definition:</b> <a href="asio__waitable__native__hndl_8hpp_source.html#l00080">asio_waitable_native_hndl.hpp:81</a></div></div>
<div class="ttc" id="adetail_2transport__fwd_8hpp_html"><div class="ttname"><a href="detail_2transport__fwd_8hpp.html">transport_fwd.hpp</a></div></div>
<div class="ttc" id="aipc__core_2src_2ipc_2transport_2error_8hpp_html"><div class="ttname"><a href="ipc__core_2src_2ipc_2transport_2error_8hpp.html">error.hpp</a></div></div>
<div class="ttc" id="anamespaceipc_1_1transport_1_1error_html_adfef15ef4e76cc55d652fbd9c2797297aa667487757f9d6300f6888bac40bcc24"><div class="ttname"><a href="namespaceipc_1_1transport_1_1error.html#adfef15ef4e76cc55d652fbd9c2797297aa667487757f9d6300f6888bac40bcc24">ipc::transport::error::Code::S_SYNC_IO_WOULD_BLOCK</a></div><div class="ttdeci">@ S_SYNC_IO_WOULD_BLOCK</div><div class="ttdoc">A sync_io operation could not immediately complete; it will complete contingent on active async-wait ...</div></div>
<div class="ttc" id="anamespaceipc_1_1transport_1_1error_html_adfef15ef4e76cc55d652fbd9c2797297afe29343445a7bf167cc186a44bd2c6ed"><div class="ttname"><a href="namespaceipc_1_1transport_1_1error.html#adfef15ef4e76cc55d652fbd9c2797297afe29343445a7bf167cc186a44bd2c6ed">ipc::transport::error::Code::S_OBJECT_SHUTDOWN_ABORTED_COMPLETION_HANDLER</a></div><div class="ttdeci">@ S_OBJECT_SHUTDOWN_ABORTED_COMPLETION_HANDLER</div><div class="ttdoc">Async completion handler is being called prematurely, because underlying object is shutting down,...</div></div>
<div class="ttc" id="anamespaceipc_1_1transport_1_1sync__io_html"><div class="ttname"><a href="namespaceipc_1_1transport_1_1sync__io.html">ipc::transport::sync_io</a></div><div class="ttdoc">sync_io-pattern counterparts to async-I/O-pattern object types in parent namespace ipc::transport.</div><div class="ttdef"><b>Definition:</b> <a href="detail_2transport__fwd_8hpp_source.html#l00069">transport_fwd.hpp:70</a></div></div>
<div class="ttc" id="anamespaceipc_1_1util_1_1sync__io_html_ac6973c71fc70c6d867b0f2255c642532"><div class="ttname"><a href="namespaceipc_1_1util_1_1sync__io.html#ac6973c71fc70c6d867b0f2255c642532">ipc::util::sync_io::Task_ptr</a></div><div class="ttdeci">boost::shared_ptr&lt; Task &gt; Task_ptr</div><div class="ttdoc">Short-hand for ref-counted pointer to a Function&lt;&gt; that takes no arguments and returns nothing; in pa...</div><div class="ttdef"><b>Definition:</b> <a href="sync__io__fwd_8hpp_source.html#l00585">sync_io_fwd.hpp:585</a></div></div>
<div class="ttc" id="anamespaceipc_1_1util_html_a6cb62ae434900f3a8915b33ec5d61a96"><div class="ttname"><a href="namespaceipc_1_1util.html#a6cb62ae434900f3a8915b33ec5d61a96">ipc::util::Blob_mutable</a></div><div class="ttdeci">boost::asio::mutable_buffer Blob_mutable</div><div class="ttdoc">Short-hand for an mutable blob somewhere in memory, stored as exactly a void* and a size_t.</div><div class="ttdef"><b>Definition:</b> <a href="util__fwd_8hpp_source.html#l00140">util_fwd.hpp:140</a></div></div>
<div class="ttc" id="anamespaceipc_1_1util_html_ac66141280c3b7295a86b65209f31cc58"><div class="ttname"><a href="namespaceipc_1_1util.html#ac66141280c3b7295a86b65209f31cc58">ipc::util::Fine_duration</a></div><div class="ttdeci">flow::Fine_duration Fine_duration</div><div class="ttdoc">Short-hand for Flow's Fine_duration.</div><div class="ttdef"><b>Definition:</b> <a href="util__fwd_8hpp_source.html#l00117">util_fwd.hpp:117</a></div></div>
<div class="ttc" id="anamespaceipc_1_1util_html_ae6ac47812a90d1287c61e0b7de7bc4f5"><div class="ttname"><a href="namespaceipc_1_1util.html#ae6ac47812a90d1287c61e0b7de7bc4f5">ipc::util::String_view</a></div><div class="ttdeci">flow::util::String_view String_view</div><div class="ttdoc">Short-hand for Flow's String_view.</div><div class="ttdef"><b>Definition:</b> <a href="util__fwd_8hpp_source.html#l00115">util_fwd.hpp:115</a></div></div>
<div class="ttc" id="anamespaceipc_html_a4ccdeed058222c635745a4dc830e99f7"><div class="ttname"><a href="namespaceipc.html#a4ccdeed058222c635745a4dc830e99f7">ipc::Log_component</a></div><div class="ttdeci">Log_component</div><div class="ttdoc">The flow::log::Component payload enumeration containing various log components used by Flow-IPC inter...</div><div class="ttdef"><b>Definition:</b> <a href="common_8hpp_source.html#l00322">common.hpp:323</a></div></div>
<div class="ttc" id="anamespaceipc_html_aa3192e586cc45d3e7c22463bf2760f89"><div class="ttname"><a href="namespaceipc.html#aa3192e586cc45d3e7c22463bf2760f89">ipc::Error_code</a></div><div class="ttdeci">flow::Error_code Error_code</div><div class="ttdoc">Short-hand for flow::Error_code which is very common.</div><div class="ttdef"><b>Definition:</b> <a href="common_8hpp_source.html#l00298">common.hpp:298</a></div></div>
<div class="ttc" id="astructipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver_1_1User__request_html"><div class="ttname"><a href="structipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver_1_1User__request.html">ipc::transport::sync_io::Async_adapter_receiver::User_request</a></div><div class="ttdoc">Data store representing a deficit user async-receive request: either one being currently handled by m...</div><div class="ttdef"><b>Definition:</b> <a href="async__adapter__rcv_8hpp_source.html#l00173">async_adapter_rcv.hpp:174</a></div></div>
<div class="ttc" id="astructipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver_1_1User__request_html_a2d0ba069841a0d43bb5c173f9b4ea0b5"><div class="ttname"><a href="structipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver_1_1User__request.html#a2d0ba069841a0d43bb5c173f9b4ea0b5">ipc::transport::sync_io::Async_adapter_receiver::User_request::m_target_hndl_ptr</a></div><div class="ttdeci">Native_handle * m_target_hndl_ptr</div><div class="ttdoc">See async_receive_native_handle() target_hndl. Null for async_receive_blob().</div><div class="ttdef"><b>Definition:</b> <a href="async__adapter__rcv_8hpp_source.html#l00183">async_adapter_rcv.hpp:183</a></div></div>
<div class="ttc" id="astructipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver_1_1User__request_html_a8071b7e47453d21bd86665c15af7949d"><div class="ttname"><a href="structipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver_1_1User__request.html#a8071b7e47453d21bd86665c15af7949d">ipc::transport::sync_io::Async_adapter_receiver::User_request::m_target_meta_blob</a></div><div class="ttdeci">util::Blob_mutable m_target_meta_blob</div><div class="ttdoc">See async_receive_native_handle() target_meta_blob. Or see async_receive_blob() target_blob.</div><div class="ttdef"><b>Definition:</b> <a href="async__adapter__rcv_8hpp_source.html#l00186">async_adapter_rcv.hpp:186</a></div></div>
<div class="ttc" id="astructipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver_1_1User__request_html_ad716a5458992596636d5e3e4f9d83e9b"><div class="ttname"><a href="structipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver_1_1User__request.html#ad716a5458992596636d5e3e4f9d83e9b">ipc::transport::sync_io::Async_adapter_receiver::User_request::Ptr</a></div><div class="ttdeci">boost::movelib::unique_ptr&lt; User_request &gt; Ptr</div><div class="ttdoc">Short-hand for unique_ptr to this.</div><div class="ttdef"><b>Definition:</b> <a href="async__adapter__rcv_8hpp_source.html#l00178">async_adapter_rcv.hpp:178</a></div></div>
<div class="ttc" id="astructipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver_1_1User__request_html_ae115cdc89f6f07b72908be17bbde3208"><div class="ttname"><a href="structipc_1_1transport_1_1sync__io_1_1Async__adapter__receiver_1_1User__request.html#ae115cdc89f6f07b72908be17bbde3208">ipc::transport::sync_io::Async_adapter_receiver::User_request::m_on_done_func</a></div><div class="ttdeci">flow::async::Task_asio_err_sz m_on_done_func</div><div class="ttdoc">See async_receive_native_handle() or async_receive_blob() on_done_func.</div><div class="ttdef"><b>Definition:</b> <a href="async__adapter__rcv_8hpp_source.html#l00189">async_adapter_rcv.hpp:189</a></div></div>
<div class="ttc" id="astructipc_1_1util_1_1Native__handle_html"><div class="ttname"><a href="structipc_1_1util_1_1Native__handle.html">ipc::util::Native_handle</a></div><div class="ttdoc">A monolayer-thin wrapper around a native handle, a/k/a descriptor a/k/a FD.</div><div class="ttdef"><b>Definition:</b> <a href="native__handle_8hpp_source.html#l00062">native_handle.hpp:63</a></div></div>
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